Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e74fd4fbc6c0d2…

MALICIOUS

PDF

78.0 KB Created: 2021-04-04 22:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: cc93fc50fc719328a4668b4c0ecae9ee SHA-1: 21ce0fcfe7c063df884deee26e66a7fd7927f7a0 SHA-256: 93e74fd4fbc6c0d290067cd08083e66f36057d0450389322d633699891257be0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=que+es+antiseptico+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393028/normal_60166002162c6.pdfIn PDF document text
    • http://lowabunuzoxa.getenjoyment.net/third_conditional_exercises_autoenglish.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416131/normal_600c065f08ade.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/midnight_sun_stephenie_meyer_book_2.pdfIn PDF document text
    • https://refodalisa.weebly.com/uploads/1/3/4/4/134437853/b3a895b9356.pdfIn PDF document text
    • https://bomaripuxizidul.weebly.com/uploads/1/3/4/9/134901287/fizamugek.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/NhaW4gi/soccer_world_cup_2018_song.pdfIn PDF document text
    • https://cdn.sqhk.co/pufuxogife/eacHX2m/tomupaw.pdfIn PDF document text
    • https://geligafut.weebly.com/uploads/1/3/4/0/134012400/guzar-natajadod-bimiwe-xetudanil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379618/normal_5fc9d0524ad12.pdfIn PDF document text
    • http://muxoman.mygamesonline.org/introductory_algebra_bittinger.pdfIn PDF document text
    • https://kesafukiwunutab.weebly.com/uploads/1/3/4/9/134900694/sovajagotomo.pdfIn PDF document text
    • https://cdn.sqhk.co/momogajopi/Akwhhji/72634234867.pdfIn PDF document text
    • http://dipunag.getenjoyment.net/canara_bank_neft_form_download.pdfIn PDF document text
    • https://nibafokabatawal.weebly.com/uploads/1/3/0/9/130970001/35f1a15432eb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390330/normal_601332921568d.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/1ecdbb4f-0b2a-4c98-91fb-4d9e3527bf26/why_my_whirlpool_dishwasher_wont_drain.pdfIn PDF document text
    • http://mewabetowa.myartsonline.com/28009954754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72364ee5-6ba5-47d8-aec0-d3584e17a720/7245505109.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_off0000f2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 5084 bytes
SHA-256: 7100e06dad33e096013cc73397dab87f067bf6a9ef76055c4cc615abafb07b97
font_01_sfnt_off0001040c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040C 11516 bytes
SHA-256: 0fd7c49604418456bbda76cea10bd9f74a270f4379c7e6f6cdfa8b89885587ef

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