Malicious PDF — malware analysis report

Static analysis result for SHA-256 32af17f26c5c34b2…

MALICIOUS

PDF

81.1 KB Created: 2021-05-24 00:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cb1c03609d96aa1f241e234b24996a7 SHA-1: 5d3f0d8a0c755ac393e97d42e6291921aaf9abe5 SHA-256: 32af17f26c5c34b23f1d98a1608ad8c368469f83dc1939ec25e3d24882c0e20b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to seemingly unrelated content, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=how+do+i+breed+kuhli+loach
    • https://sajaxelofokaxus.weebly.com/uploads/1/3/0/7/130776185/xokipemejusani_wakol_zulugikowalesev_kilos.pdf
    • https://wufaderafezika.weebly.com/uploads/1/3/0/7/130776219/1417150.pdf
    • https://lamamamim.weebly.com/uploads/1/3/1/6/131606140/zawenuvuzedi-dogidemi-xasiliruf.pdf
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/6713602.pdf
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/xogif.pdf
    • https://sibitolifi.weebly.com/uploads/1/3/4/7/134732274/7822643.pdf
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/xusuvibo.pdf
    • https://janirakuvofubej.weebly.com/uploads/1/3/4/7/134734148/tepakofuziga.pdf
    • https://sudusiwigi.weebly.com/uploads/1/3/1/0/131069987/gidegufaketinir.pdf
    • https://biwizodem.weebly.com/uploads/1/3/4/6/134650183/1d8674bb64.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a6ced3a5-9a23-4f42-afbc-50962eab2257/49176240744.pdf
    • https://uploads.strikinglycdn.com/files/cbdd1a6f-f971-437c-a842-1caa62be652b/ohms_law_worksheet_answers_key.pdf
    • https://uploads.strikinglycdn.com/files/661ae838-ae77-46ed-bb5b-05160b1360ad/86114154344.pdf
    • https://uploads.strikinglycdn.com/files/8007b656-68a6-4fdf-80be-0f51561f68c9/30293167674.pdf
    • https://uploads.strikinglycdn.com/files/6b468a65-16f8-4a3c-a3b8-5f62ff91eafb/social_contract_meaning.pdf
    • https://uploads.strikinglycdn.com/files/e805a0b3-c9a4-45cd-b543-97266b3affdc/whats_retroactive_pay.pdf
    • https://uploads.strikinglycdn.com/files/7548add2-6230-456e-b38a-1d36910af91d/is_newsmax_channel_on_spectrum.pdf
    • https://uploads.strikinglycdn.com/files/4b34c01d-0714-4a45-88da-04b1ef45da09/robasamebag.pdf
    • https://uploads.strikinglycdn.com/files/ec8077a6-4f3f-4a71-a9b0-2ce858997351/90321610448.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff3b.bin
7030cafec560cfc390b7060a2d44c62f72ba5c9bccbf41a27e4a0541a70c6ac3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 5104 bytes
font_01_sfnt_off0001109e.bin
b51a9f354139866a4bbf2c0220eb4cac62ded4a0abd9bac64fd44173f1ed0297		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1109E 11032 bytes

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