Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed786be4c5af6a3…

MALICIOUS

PDF

75.6 KB Created: 2021-03-30 00:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8ed8af87c0a1f8846d5fac32fbf55eb5 SHA-1: 98023da7e62574f7649bdd66d5550395d82a2a99 SHA-256: aed786be4c5af6a30725e98ccc3c4cbbe531f6ed01021f37a540b603d01de5be
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=clock+face+worksheet+printable PDF link annotation
    • https://cdn.sqhk.co/vopofuxo/eIhiTym/bloodborne_chalice_ritual_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/tavolimogid/d5hcmgi/destiny_summoner_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/jikowuzu/aIcjgif/usa_today_nfl_picks_week_6_2019.pdfIn PDF document text
    • https://wadasowodasi.weebly.com/uploads/1/3/5/3/135316150/rudajomo.pdfIn PDF document text
    • http://goldstein.berlin/89663447197wrcts.pdfIn PDF document text
    • http://foyou.store/42626952356bl7em.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/voravowubikir-rakajozuno.pdfIn PDF document text
    • https://mafugefowodofo.weebly.com/uploads/1/3/1/3/131378796/3a5d59.pdfIn PDF document text
    • http://jakartapro.xyz/zewigijiwanedojezrywe3.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/coifdgc/90962039915.pdfIn PDF document text
    • https://tefitosuwit.weebly.com/uploads/1/3/4/4/134478986/tisirimakofizeseriwe.pdfIn PDF document text
    • http://richteam.site/airbnb_pitch_deckwb1hv.pdfIn PDF document text
    • https://xidamosu.weebly.com/uploads/1/3/4/7/134707329/d6057.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/bf3f5b92-1a77-47c5-aa43-f8315389c1aa/38783595055.pdfIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_91ef85e67f7e4f678c03a6edb4bf527c.pdf?index=trueIn PDF document text
    • https://c7e723d0-7712-45a3-a8dd-8d8935e7c5e2.filesusr.com/ugd/c4f451_0c26f7b5b2f94fd58b546342a7c6acb1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39738575-4cb2-409e-b6a4-3463d9400b4b/50840347954.pdfIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_388caa73dd0143c79f43e49175776dcb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cfba0cd-b2dd-4498-b47b-c6ddbe01887d/2349256034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b86b8680-010f-43d9-8f63-a918d4fc6176/tanibodefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f0df4ca-65e6-482c-8a92-0ae07d4c0a39/gidiraxonovutekoz.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_off0000e809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE809 5304 bytes
SHA-256: d0c30d2b57084905c6297160037da1da6ed47b4f4d49812e6470c1b64df5e84e
font_01_sfnt_off0000fa1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1E 10908 bytes
SHA-256: af59db8b3f4134b32ea4dfe5a5225d4573b83d83bbc33a634dc0987656bd1df7

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