Malicious PDF — malware analysis report

Static analysis result for SHA-256 1437fdf7729fc3ba…

MALICIOUS

PDF

80.0 KB Created: 2021-04-04 03:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 9a3f0034c3962984ce4d8673054da05c SHA-1: 24f007eefac82292acf5101b78eb0f3920b3e008 SHA-256: 1437fdf7729fc3baade68179377dd13602c8f27cdc764e95d35485fda84a11eb
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classification 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 designed to redirect users to malicious content. The document's content is presented as assembly instructions, a common lure for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to distribute malware, potentially via embedded JavaScript or other exploits.

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://cdn.sqhk.co/goxepijikun/gchaYib/53915953431.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4452148/normal_606423717f18c.pdfIn PDF document text
    • https://cdn.sqhk.co/fetebutujo/idgfujg/diversion_synonym_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/hbibhgc/87528995614.pdfIn PDF document text
    • https://cdn.sqhk.co/miraroki/G2mgjji/wuromegixavurudesupev.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/ibgje0a/ringtone_download_for_iphone_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451212/normal_604e1b15be1d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467910/normal_5fc72873de4ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496853/normal_60121fbf40544.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
    • http://feedproxy.google.com/~r/wb/ENAH/~3/mO-5lVq97NI/wb?keyword=mainstays%20nightstand%20assembly%20instructionsPDF link annotation
    • https://uploads.strikinglycdn.com/files/51e8bcdc-2248-40d6-ac34-3c0da556bc8a/ferimutebegudemodoz.pdfIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_91afefe55dd94f71ba9a42dafdc64ae3.pdf?index=trueIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_2ad9725944c8455a81ee9d72c0ba844c.pdf?index=trueIn PDF document text
    • http://wegajovekesowor.epizy.com/98471595831.pdfIn PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_1c66a010f900424586e41b6808fc761c.pdf?index=trueIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_ad47538c0d6f477cbceef084374716ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/32b52528-4d8d-440c-a207-2643fe5438d0/49714611396.pdfIn PDF document text
    • http://liwivudelaje.epizy.com/singer_simple_3232_manual_espaol.pdfIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_3285aadf712746c4a8d9bcdf18d3fe3f.pdf?index=trueIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_2169d325de4f4c2bb8f8b5c290a039a3.pdf?index=trueIn PDF document text
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_c41b2a4d9a6b4460bddd05e5bc769b5d.pdf?index=trueIn PDF document text
    • http://ponuwisakaso.rf.gd/getting_to_the_bottom_of_triple_bottom_line.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED34 5484 bytes
SHA-256: d031c9d082ceb23bf0bc2ab5a41e2283c17ee87ab02bfd4ba720a416a941373f
font_01_sfnt_off0000ffa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA9 10752 bytes
SHA-256: 6d895a6ba48f8871f03c3ae1475918a45d670595fc957aa379550b0e85a35223
font_02_sfnt_off00012415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12415 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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