Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc519e94637de3fc…

MALICIOUS

PDF

70.9 KB Created: 2021-03-02 01:55:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 31f45ca74b6cdf366e1186537b89da73 SHA-1: 031382bcfe75d9d98121ef49e35f260abb009a01 SHA-256: bc519e94637de3fcff8b577b9fd214c9fdc091396554174325199efbeff8f5a8
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with a critical heuristic firing for PDF_SEO_LINK_FARM. The primary malicious URL observed is http://afracheat6.xyz/jejiziwov8bh8.pdf, which is likely a second-stage payload or a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

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
  • 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://jottigo.ru/award?keyword=whats+an+ivr+pin PDF link annotation
    • http://afracheat6.xyz/jejiziwov8bh8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384633/normal_60081ea7ae403.pdfIn PDF document text
    • https://girenofozajete.weebly.com/uploads/1/3/4/4/134476001/jepusazopedobesini.pdfIn PDF document text
    • https://tunikasas.weebly.com/uploads/1/3/1/4/131438809/fufiwuzodutuw.pdfIn PDF document text
    • https://zutuvibob.weebly.com/uploads/1/3/1/4/131407898/gavafodimesimit-sarebuzan-sulebi.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/2351184.pdfIn PDF document text
    • https://xaredoluvowa.weebly.com/uploads/1/3/1/8/131871785/a886375ebd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377663/normal_60265b6a137ec.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/pub_217_maneuvering_board_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423750/normal_600d24d64d873.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/kikunojulejuj/adjectives_adverb_noun_and_verb_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/nuxijukisakufomajipomamen.pdfIn PDF document text
    • http://tivakifuzir.atwebpages.com/88302253301.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/muketurukis.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/67356174506.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/i_would_like_to_meet_you_formal.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/3016874332.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/44454241556.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/jogugafupixunodoxowuz.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_off0000db87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 4948 bytes
SHA-256: 790f1ebbd490f8681f14cfcd658be7ffa3eb1926da293e95f6bfe2bbf2f266ef
font_01_sfnt_off0000ec66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 9984 bytes
SHA-256: b7a4c048433df505316bbd7ab8bca558a677b327c20d8e3aae033b05c47e13c9

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