Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3f3408fa3853af…

MALICIOUS

PDF

90.7 KB Created: 2021-03-08 15:36:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1eb8d46a977ad3622a7d51ce610ba0e6 SHA-1: 2ee65b9a49d7010bbfd1d0a926b4e98545bd579c SHA-256: 5b3f3408fa3853af32b6abd913b5da77cdb1679dd238e840fcb2748114de86ae
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://jumiwimov.ru/wix?keyword=blue+collar+brilliance+article PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401985/normal_602b4518273bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387703/normal_603a072bc3d73.pdfIn PDF document text
    • http://50offstore.info/xelojixagukedemvx1m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385202/normal_600dda398e46d.pdfIn PDF document text
    • https://wiludexubusut.weebly.com/uploads/1/3/2/7/132740186/miwezezezatuniw_zilegivugut_vigifitovuzajoj.pdfIn PDF document text
    • https://kurexutolik.weebly.com/uploads/1/3/5/3/135350225/387a0c2fdc5b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414847/normal_6014535ed67ad.pdfIn PDF document text
    • http://ig-mediateam.net/67777660737ay9hu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455179/normal_602d7778153ba.pdfIn PDF document text
    • https://xurugafidas.weebly.com/uploads/1/3/6/0/136081795/vawokiziser.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386091/normal_5fea03f56c6a3.pdfIn PDF document text
    • https://serogewuf.weebly.com/uploads/1/3/4/6/134615077/8e81d4c2d48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413707/normal_60082c9a8a417.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475000/normal_6016643527e96.pdfIn PDF document text
    • http://flymoney.net/yamaha_gb1_baby_grand_piano_for_sale1ryqm.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/070129be-58ee-4532-a451-3a5265c51a6e/dukofaw.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/wamemonoge.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/how_to_reset_garmin_gps_78sc.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/cartoon_video_maker_android.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/nakejolupogokarela.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/32286626994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0366a9b-de49-4c71-94e7-3515d13b2c03/how_do_you_describe_a_waxing_moon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5912450c-ac07-4cb9-bdeb-0b827526b5d4/69954486899.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_off0001276d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276D 4804 bytes
SHA-256: fe60f7be6e70d5fe2f0f005f58ec4dda2a1a907e7ca8428e567a7923975d2866
font_01_sfnt_off000137d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D3 11196 bytes
SHA-256: 51ea112d2ac82361f27889b634c092b92dd36121bc436b1a5f717f60aedec760

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