Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39528f6ecc87182…

MALICIOUS

PDF

63.1 KB Created: 2021-01-23 18:06:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2a46fb38b71559b3a909ba1088ed610c SHA-1: 7ea4b0e0a26b0a3b6b096e9e2569e835babbd180 SHA-256: a39528f6ecc871825f08e9424313abb8b5732f9e00a2ce6e8e1da8a481ef038a
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a redirector to malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of many external PDF links suggests a link farm or SEO poisoning tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffking.ru/123?utm_term=big+joe+milano+bean+bag+chair+multiple+colors In PDF document text
    • https://cdn.sqhk.co/tezakagadol/iZHbeid/hockey_goalie_pads_history.pdfIn PDF document text
    • http://dadosib.22web.org/93025801337.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/agibjgR/hypixel_smash_heroes_best_class.pdfIn PDF document text
    • https://cdn.sqhk.co/xidupesijij/cjjGRha/ritanixerudulijabow.pdfIn PDF document text
    • https://cdn.sqhk.co/kezulegol/78gc3ic/31072596102.pdfIn PDF document text
    • https://gejipowuxenufo.weebly.com/uploads/1/3/4/6/134681439/duvajik.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/gjR8Vum/91326027437.pdfIn PDF document text
    • https://cdn.sqhk.co/ludibipimilu/ijdiahe/deziderulozadewe.pdfIn PDF document text
    • http://nakezubelakibe.22web.org/42677994205.pdfIn PDF document text
    • https://vimixake.weebly.com/uploads/1/3/1/1/131164471/4076217.pdfIn PDF document text
    • https://cdn.sqhk.co/felebamifuk/gnPt5je/nenatosujepelemat.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/c4njajd/notubedebuzoja.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/Yqgcgix/29274656993.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/hdgjSNv/call_from_scps_games.pdfIn PDF document text
    • https://cdn.sqhk.co/gubogezemazo/kqhfiaB/forarokiliba.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvurero/dijHAgg/little_alchemy_cheats_list_580.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kubozivomojiva.epizy.com/zadewodadimojotile.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_off0000b9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A6 5612 bytes
SHA-256: 78c568eb7c9b185690bdb353c217b8a80c0b1fec39d511255e445d9be6f27912
font_01_sfnt_off0000cc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8F 10132 bytes
SHA-256: c5c227fbfb9a80f95c0147c73153a9beba78bcd62da9ea982f56c44f3ba52596

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