Malicious PDF — malware analysis report

Static analysis result for SHA-256 594cfecd3d9d3296…

MALICIOUS

PDF

70.2 KB Created: 2020-12-30 03:49:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b8641683061777a3b7d3596767835294 SHA-1: 9a87f8e94825bc6ea11b422180b7db0948498f96 SHA-256: 594cfecd3d9d3296d08dc1bf5ec8b093b2ab43513d043872d33e58485a49999d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with one prominent example being a link to a PDF hosted on cdn.sqhk.co. The document body, though heavily obfuscated, contains text related to 'Stem club subscription', suggesting a lure for users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://traffnew.ru/123?utm_term=stem+club+subscription PDF link annotation
    • https://cdn.sqhk.co/luwiwaduna/djbjDjc/clash_of_clans_valkyrie_attack_strategy_th10.pdfIn PDF document text
    • https://cdn.sqhk.co/tezakagadol/jkbOhcq/mojure.pdfIn PDF document text
    • https://cdn.sqhk.co/latusetime/3Zjwjc6/dosizitaliwirubokomiw.pdfIn PDF document text
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/8b19625c8.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/9fIhbhd/mirrors_for_sale_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/zoboxoba/7jhpljb/86578439636.pdfIn PDF document text
    • https://cdn.sqhk.co/kagofiwavum/UmRzZrR/dekurawolekiduxu.pdfIn PDF document text
    • https://cdn.sqhk.co/dubagelojuwe/hdidITZ/84723356113.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/dujekukovuzenuzigik.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/lavija.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/93752005483.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/municipal_solid_waste_management_thesis.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/70562023674.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_off0000d563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD563 5112 bytes
SHA-256: 956d11d6a9bad71f6208e7a9d4034660cfa0bf7970c4df09e4b83a191df04d51
font_01_sfnt_off0000e6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 10972 bytes
SHA-256: 6ccd617fa96929bffe6e497ff815469cd76142cbe73e3d44e7b03f0e8dd66d57

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