Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a6633fcbf34d81…

MALICIOUS

PDF

77.0 KB Created: 2021-03-30 11:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 70d6e78989190a583b8bbda4cb5bd57a SHA-1: c5e3192e7c909a732c86fd477be64b2dc30a374e SHA-256: d6a6633fcbf34d81c1d6c496e2ff1507abc511b36e61b932ff8a790629111be0
186 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO abuse tactic. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards techniques used to redirect users to potentially harmful content or phishing sites.

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://golowaki.ru/wix?keyword=accounting+chapter+12+study+guide+pdf PDF link annotation
    • https://menaxogem.weebly.com/uploads/1/3/4/4/134432074/4156d77d3.pdfIn PDF document text
    • https://voxudipuxun.weebly.com/uploads/1/3/5/3/135319737/ximig_kilekopenilema_fofewipoke_zujagupovoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490256/normal_601a714f5d902.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461245/normal_5fdfd3b554adc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478378/normal_601830f63fde2.pdfIn PDF document text
    • http://kebotup.66ghz.com/mtg_ad_nauseam_deck_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423728/normal_5ff7ad3a81b98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454277/normal_5fe41b715ed63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402745/normal_5fecadd26dc05.pdfIn PDF document text
    • http://denuziwu.iblogger.org/tatalaksana_filariasis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417648/normal_604b84b49ff66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_60230911a2711.pdfIn PDF document text
    • http://mibikazut.mypressonline.com/blacksmithing_projects.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390374/normal_606262688c550.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://97e6e6c8-040d-427c-ad66-6ef02350ae38.filesusr.com/ugd/9c523c_1955f83addc64a59b839b5c2d5b6e8d5.pdf?index=trueIn PDF document text
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_920b80f38f0341d187101979b1b0d7b8.pdf?index=trueIn PDF document text
    • http://vuzogumav.rf.gd/46458258854.pdfIn PDF document text
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_8c548dc376844b2ca754ba7ea9a3a21a.pdf?index=trueIn PDF document text
    • http://mumawanif.rf.gd/advanced_level_english_test.pdfIn PDF document text
    • http://wukiramile.rf.gd/vufomafosefifisovez.pdfIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_fa3d4ca527154c9d8dec40ef8c3ef321.pdf?index=trueIn PDF document text
    • http://likewiwojuxus.atwebpages.com/91588606437.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_off0000ee4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4A 5660 bytes
SHA-256: b48c81aea6e5fcdee52b502cee2ff747bf57a32e4eec5d5e924d65f9a23a021a
font_01_sfnt_off0001019a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019A 10816 bytes
SHA-256: 9d053657515d312adf890c38621da358a6bb19692375f75ec415127500347ffc