Malicious PDF — malware analysis report

Static analysis result for SHA-256 945418e9641373b0…

MALICIOUS

PDF

79.9 KB Created: 2021-06-12 17:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5e7b199b1c84e1c61d46f087d1ba1caa SHA-1: 3ee9b6d929bfb9c950783ac0ebb63a587f92fceb SHA-256: 945418e9641373b063f8cf7b280a94543399dc316081d9b495582747b5a3da20
186 Risk Score

Malware Insights

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

The PDF file contains a link farm with multiple external URLs, one of which is identified as a potential phishing or malware distribution point. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely masquerading as a utility or tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://smidgel.ru/pbw?utm_term=wifi+router+hacking+apk PDF link annotation
    • https://vepiniripalur.weebly.com/uploads/1/3/4/2/134235349/wusovum.pdfIn PDF document text
    • https://nisikigibifug.weebly.com/uploads/1/3/0/8/130813528/9256743.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487902/normal_604b7054cc91a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490547/normal_602c058e3baef.pdfIn PDF document text
    • https://movamapipimopi.weebly.com/uploads/1/3/5/3/135303402/159219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494166/normal_603ed1fc26240.pdfIn PDF document text
    • https://xopubisewono.weebly.com/uploads/1/3/4/5/134507782/warapukebalululipidi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425924/normal_6059551252000.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4383913/normal_60b001a22f01c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7bbccae4-0eef-4cfb-b734-71948ffea3bf/855390214.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/download_fashion_story_mod_apk_unlimited_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2624d027-bfa2-441f-934e-f1b728b68906/vegekoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69b7a1cf-d326-44dc-9e34-113130050c2e/disadvantages_of_polluter_pays_principle.pdfIn PDF document text
    • http://xizalow.pbworks.com/f/most_used_1000_words_in_english.pdfIn PDF document text
    • http://xugatun.pbworks.com/f/84374404985.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c43110d4-a1b8-4a67-bde0-20ca220913de/how_to_set_the_clock_on_pioneer_deh-s4000bt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e4559b8-395f-47f5-9dea-c1d878085647/sararetugaboli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24a2f08a-5a98-4506-b79b-5696df767ee1/32032965444.pdfIn PDF document text
    • http://wepoline.pbworks.com/f/how_pollution_affects_aquatic_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44ab3d9d-fdf2-41d3-b8a9-9dff8acf7c24/mutataviwokojipazik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c96f3d70-4f1f-463d-aec1-1a11e2c37087/four_freedoms_speech_rhetorical_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99f36d17-37fa-4d6c-aeb6-38f2449db9ff/20759747374.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56c00252-c7c0-4b78-bad7-b69aadd1293e/wawusadeve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b21181a-14c0-4502-890e-45b8a4d28feb/how_much_is_a_used_2015_chevy_cruze_worth.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 2880 bytes
SHA-256: 619a44e8b5c2a2d3fc0e18259d8022938ad4f8b30552901bc68dc41c3d0f2ef0
font_01_sfnt_off0000ecab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 5024 bytes
SHA-256: 9940abaae04530894d1bb408e18c5170e2597fa1cc03b8695b3aea283927fd98
font_02_sfnt_off0000fdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCF 11008 bytes
SHA-256: c820f069298727d0939c6c4028f3d3110b3de7ff27f3a0edadff0a8fa570dcee
font_03_sfnt_off00012385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12385 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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