Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6d97a332252d4a…

MALICIOUS

PDF

80.6 KB Created: 2021-03-24 02:51:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: e943fcec16d5c0eb1cf57604285dc522 SHA-1: 9730d4e5423765fd3a11b1efc8d5caaabb19a4ad SHA-256: 6a6d97a332252d4a55fb164e0a8a66a1a5e3620a511516705d96f8e90c29708a
244 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple critical heuristics as a malicious redirector and a link farm. It contains numerous links to external PDF files, many of which are hosted on disposable domains, suggesting a phishing or SEO spam campaign. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of numerous malicious links points to a phishing or content manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crophysi.ru/award?keyword=articles+worksheet+for+class+5+pdf In PDF document text
    • http://mrshadow.net/classifying_matter_find_the_hidden_image_answerqe94p.pdfIn PDF document text
    • http://usmileofficial.site/capital_asset_pricing_model_questionplpfo.pdfIn PDF document text
    • http://ontrade.top/81928251459ibwre.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393904/normal_6000b17c174e9.pdfIn PDF document text
    • https://jinajifija.weebly.com/uploads/1/3/4/8/134889339/vezulemazevewuwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489050/normal_604181259936f.pdfIn PDF document text
    • http://wbigs.space/balearia_horario_ferry_ibiza_formentera9tmr3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371020/normal_600408d9916ae.pdfIn PDF document text
    • http://sochi2026.com/mojenipufegomdazkn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459628/normal_603323aebcd89.pdfIn PDF document text
    • https://relabibede.weebly.com/uploads/1/3/2/8/132816075/sunamusu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446379/normal_6010f8dfbb0ab.pdfIn PDF document text
    • https://sodikisug.weebly.com/uploads/1/3/1/4/131437766/zoxukomibijoko.pdfIn PDF document text
    • https://liramuxusere.weebly.com/uploads/1/3/4/5/134577046/mifap-topulijotelomur.pdfIn PDF document text
    • http://b0xberry.online/sejovajigimukoxuzj98pv.pdfIn PDF document text
    • https://pulijapejupexeb.weebly.com/uploads/1/3/4/0/134041872/06089aa4ff.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/d9449637-fb04-44ba-b589-816b7d056627/how_to_install_scapy_in_kali_linux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7e9e320-e635-45c7-b395-bed8cf08f6ec/50017588056.pdfIn PDF document text
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_779718e0abb346b88e7647be8155c18d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd038c6f-46a2-413a-ad5e-de96a38f6302/35221761981.pdfIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_c23831029e8649c19756cd50edd66fea.pdf?index=trueIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_ab2e036a8fbc4eae94c9c3fc2fc3af61.pdf?index=trueIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_8bb6ea0f72bb4069976162d7c11fbbd2.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 5192 bytes
SHA-256: 69152335811793d87582a938a2a6d59d696a112b01083207c137f95a169531cb
font_01_sfnt_off00010330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10330 10484 bytes
SHA-256: f14d56209f9a3cc3e86fae564125d9b22f73cd119c17734676d6634fb18a49fa
font_02_sfnt_off00012701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12701 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378