Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b8a39dff5897cb…

MALICIOUS

PDF

83.7 KB Created: 2021-03-17 08:23:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 4703c4bf83cec76f04cce6c298bf1bf3 SHA-1: b18c560b1ee362a827f861691364b6f4576e2cca SHA-256: d4b8a39dff5897cb3aa5dbcb0f1f99d0c8a0aede8dbbb7f0b626a1554ec8f47f
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL leads to known malicious redirector infrastructure. The ML classifier also strongly suggests maliciousness. While no scripts were explicitly extracted, the structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/wix?keyword=global+issues+network In PDF document text
    • https://biwamuneluzotip.weebly.com/uploads/1/3/2/6/132696598/6386844.pdfIn PDF document text
    • http://shimano-stradic.ru/creative_impulse_an_introduction_to_the_arts_8th_edition_online3fknu.pdfIn PDF document text
    • https://modevibivuruwix.weebly.com/uploads/1/3/1/4/131406629/luvekafotumofa.pdfIn PDF document text
    • https://pudabesipewoz.weebly.com/uploads/1/3/0/9/130969441/9570057.pdfIn PDF document text
    • http://hotita.fun/547993291774az7j.pdfIn PDF document text
    • https://danifiwap.weebly.com/uploads/1/3/4/5/134585556/depovewozafud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420224/normal_5ff985cf76a00.pdfIn PDF document text
    • http://gbo.guru/how_to_rebuild_a_bostitch_floor_nailerzu3ix.pdfIn PDF document text
    • https://sowujapureku.weebly.com/uploads/1/3/0/9/130969862/funadufo.pdfIn PDF document text
    • http://legendbilisim.com/22259483122iunjy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393521/normal_60089a0a3cb21.pdfIn PDF document text
    • https://sabewuxibiw.weebly.com/uploads/1/3/4/7/134718514/26df0baa3.pdfIn PDF document text
    • https://dasiwijumajofep.weebly.com/uploads/1/3/0/7/130739595/3292383.pdfIn PDF document text
    • https://bipufufutugudov.weebly.com/uploads/1/3/1/1/131164095/3831895.pdfIn PDF document text
    • https://navubuxodogonid.weebly.com/uploads/1/3/5/3/135327143/4993954.pdfIn PDF document text
    • http://abzac.me/55682851962wri7c.pdfIn PDF document text
    • https://zadukali.weebly.com/uploads/1/3/5/3/135340438/32969.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fb5e6e2-3410-41d5-925e-954b663cab2e/is_the_focusrite_scarlett_a_preamp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/983e4a61-16cb-4fa5-9290-1b8f71d2e725/how_do_you_start_a_realistic_fiction_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d87f00d9-7ba0-419c-b790-622d9173bb62/55454615001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/857aab85-6475-413f-851d-cc720bc6efb1/one_mans_wilderness_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78045d87-e61a-4845-8b2b-c0d51834e4d6/william_wilson_edgar_allan_poe_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4261434f-78d6-4afd-ad27-28ead4efec80/jurusulokiwufabadinaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cd54f66-3771-4381-a33f-5d282accb2cd/bowopawiduwitudujonunex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6d599eb-f4aa-4d4c-b70f-a25c3ed55ff9/weber_grill_grates_spirit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3baf154b-8815-4ba4-88f6-d0ae1fddcf89/worlds_easiest_song_to_play_on_ukulele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8109fd31-6881-4c0e-a76c-a2b09ab6af26/canon_mg3520_wireless_setup_to_laptop.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001092b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092B 5004 bytes
SHA-256: 4d2e29728cb52747ddc5cb4f99b5c66807c3a7e815eccf260f822768353701ce
font_01_sfnt_off00011a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A52 11600 bytes
SHA-256: ca866f10c4c187ef0be1c06c311a27196abd2d7e2f6ac1e5a588008b37f88aeb

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