Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5caf61e7acabd6…

MALICIOUS

PDF

69.7 KB Created: 2021-01-13 18:02:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 76e5df6fe2481bd598a2d81d278c8864 SHA-1: d7f317415ba65633375d27867f53ad8af3b5d1fa SHA-256: 9b5caf61e7acabd63be79b3c180eadd2a9cffd5d003a82244045ca1083e7f0bf
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites. The document body text is corrupted, but the presence of 'chief information officer responsibilities' suggests a lure to attract clicks.

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
  • 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.
  • 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://trafffi.ru/aws?utm_term=chief+information+officer+responsibilities PDF link annotation
    • https://cdn.sqhk.co/zobunifi/ghjfKgh/59747758766.pdfIn PDF document text
    • https://cdn.sqhk.co/xubuguxovim/jgKiggd/tiburexexapemabotobumega.pdfIn PDF document text
    • https://fabedajigunud.weebly.com/uploads/1/3/4/4/134480588/legekof.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/2069974.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/2d42b8312.pdfIn PDF document text
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/tevirobulali-zunenovasabof.pdfIn PDF document text
    • https://powipopes.weebly.com/uploads/1/3/1/4/131406611/bfaf2c4d77217.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/Vig5nf1/north_carolina_dmv_license_plate_lookup.pdfIn PDF document text
    • https://site-1181117.mozfiles.com/files/1181117/57125961711.pdfIn PDF document text
    • https://bawujepal.weebly.com/uploads/1/3/4/5/134515469/nojuxezolofiluke.pdfIn PDF document text
    • https://kifenefaru.weebly.com/uploads/1/3/4/3/134327755/zaderefilexi_xugupo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36A 5300 bytes
SHA-256: f4380a5350dfe6a4d2a18b0d62a10b8a2ee9e10fde07a5b9692dd000d8943adc
font_01_sfnt_off0000e53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53D 10804 bytes
SHA-256: ac7a0469e6f8e7cbaf86227dc7b13bcfe20b2c8279810a9d688dbe713f721e4a

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