Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd11b46a780bef53…

MALICIOUS

PDF

88.9 KB Created: 2021-03-31 15:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b9ca505e90fe219e8cbb9eda570ae2fc SHA-1: 42e3c02a4bc4bdac2450ddc15fda41a080cebfb2 SHA-256: dd11b46a780bef53f8d6d2f9f2dde6e1342f99e27587cf1f0f704e012caa3f25
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a link farm designed to manipulate search engine results or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://midufefew.ru/award?keyword=las+mil+frases+mas+usadas+en+ingles+pdf PDF link annotation
    • http://akfb.online/hot_dog_keep_away_gameoe8hi.pdfIn PDF document text
    • https://mewodufupojapoz.weebly.com/uploads/1/3/1/8/131857890/topidemof-bixotopesuwimix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_6056cefdd5839.pdfIn PDF document text
    • https://tumunuwixa.weebly.com/uploads/1/3/1/3/131384432/b91af1bf40b9c.pdfIn PDF document text
    • https://bonujuvab.weebly.com/uploads/1/3/2/7/132740321/62db7c4245b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_6043253bb96b6.pdfIn PDF document text
    • https://felinabaf.weebly.com/uploads/1/3/4/3/134380667/nopuzeralazuzenukip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501482/normal_5fcdb93e69221.pdfIn PDF document text
    • http://mbfsopg.com/introduction_to_human_factors_engineering_second_editionvaqrm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c1ab63b4-4781-4901-abeb-f581ed41d26f.filesusr.com/ugd/b44917_1b9c6a2eaefc4e03aab699db25bac36a.pdf?index=trueIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_17cb35db94b544b39fcf47f07e725a2b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa21eb4b-fe52-4c8a-8581-4ae6b1db225e/ritusemadavori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc5eb82c-773b-46b2-9544-94fc3756c0d7/how_to_connect_hype_true_wireless_earbuds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f5a6a8e-2cce-4cd7-ac33-8a829dcdf132/69025593037.pdfIn PDF document text
    • http://tegazadolital.rf.gd/vijibalajisozexewe.pdfIn PDF document text
    • http://wobemiko.epizy.com/how_do_i_fix_my_hp_officejet_pro_8600.pdfIn PDF document text
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_4cdbb178e99d4ebab29d0f7537e3e453.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd81d7e2-c8f1-4c6f-82b6-3208833f2d1a/arduino_projects_for_dummies_download.pdfIn PDF document text
    • http://wumokobaleto.epizy.com/narujuporifoxud.pdfIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_7f3bcb19d5a54e4288a3ed93a0d77235.pdf?index=trueIn PDF document text
    • http://vunanan.epizy.com/asphalt_xtreme_hack_tool_apk.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_off00011c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C13 5300 bytes
SHA-256: 52915ca8af018775316c980435454186414a51f619d60e026efce0e2cfbfeb89
font_01_sfnt_off00012e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E09 12252 bytes
SHA-256: 1f96fe8ccf4261e5d3c41983b3ef85d8c5c7287590658e71994921800c65782b