Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ce31c2b11149bf…

MALICIOUS

PDF

76.2 KB Created: 2021-01-11 06:27:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7b591db09e7a7ce2b72183bb82531a84 SHA-1: 07f646add00ae0f1a5bff21552f31e20419e5d77 SHA-256: 65ce31c2b11149bfab1fff715aa38cd780c52de5ffe4feb9050abaf5bd518c20
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and a known malicious redirector. The heuristic firings indicate it is a link farm designed to direct users to malicious infrastructure, potentially for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=rocky+hill+public+schools+employment In PDF document text
    • https://duxawedi.weebly.com/uploads/1/3/4/4/134477895/40223.pdfIn PDF document text
    • https://site-1183491.mozfiles.com/files/1183491/42565974443.pdfIn PDF document text
    • https://site-1173608.mozfiles.com/files/1173608/mepivigumajorij.pdfIn PDF document text
    • https://dedotomonifagax.weebly.com/uploads/1/3/1/6/131606429/773744.pdfIn PDF document text
    • https://zopavuro.weebly.com/uploads/1/3/4/5/134584556/datijaxesututipuno.pdfIn PDF document text
    • https://daliroxemonove.weebly.com/uploads/1/3/0/7/130775241/tonanaxafew.pdfIn PDF document text
    • https://dopikilazobowu.weebly.com/uploads/1/3/4/4/134488506/dimodar.pdfIn PDF document text
    • https://site-1178514.mozfiles.com/files/1178514/wehrmacht_flag_minecraft.pdfIn PDF document text
    • https://bemuzulezevateb.weebly.com/uploads/1/3/4/4/134440878/badezeluvov.pdfIn PDF document text
    • https://puwevifu.weebly.com/uploads/1/3/4/4/134465284/senifolu.pdfIn PDF document text
    • https://lamosovi.weebly.com/uploads/1/3/4/6/134600354/248b3bb3a91c.pdfIn PDF document text
    • https://lunipudazu.weebly.com/uploads/1/3/4/4/134462877/3327383.pdfIn PDF document text
    • https://site-1167953.mozfiles.com/files/1167953/girl_crush_little_big_town_live.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
    • https://s3.amazonaws.com/wiremeresegikon/85100159696.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_off0000de8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8F 5064 bytes
SHA-256: 47424463180fb29cdfb0ad16b6ab9bf8503be21e4f9ccd78ead45f51c06451d6
font_01_sfnt_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 11228 bytes
SHA-256: ab8d2e4361cc826537787a385f7297ae8571dd4330f8bc8d3ae60cf25695cf4b
font_02_sfnt_off000115d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D3 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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