Malicious PDF — malware analysis report

Static analysis result for SHA-256 839b520917f2b2a5…

MALICIOUS

PDF

78.3 KB Created: 2021-07-13 23:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a864903871cbddaef924ef491621ce05 SHA-1: 8be7a00167835946efaee1ae1bf8cbcb6aea9505 SHA-256: 839b520917f2b2a59775e6102673b8fbe8bad182646ab038b9acfbc29a7d1a5c
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The presence of a PDF_SEO_UTM_REDIRECTOR_LINK heuristic suggests the document is designed to lure users into clicking a link that redirects to a malicious site. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious purposes, and the overall detection points to a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8678

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://feedproxy.google.com/~r/razvivatel/yapz/~3/um1bUVUAM38/square?utm_term=400+gm+in+pounds PDF link annotation
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e883fe53c74a4e2499ad15/1625850878133/my_child_is_wheezing_and_coughing.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e773b14b2b7f268b9613cb/1625781169587/describe_the_difference_between_rotation_and_revolution.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e95d0f19a9f87deb749c89/1625906447154/dry_gallons_to_cubic_yards.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec88870cf33f708d7aeffe/1626114183942/93688685250.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ecab4045711547b6aa2fe4/1626123072575/195_pounds_in_kg.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec9c3ce0784948549abe1a/1626119228079/100_divided_by_40.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e84ae541b8b225466b0aa3/1625836261329/guxovanadakikizux.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD272 10400 bytes
SHA-256: 7b1191ac23b961dd72423b38fee2e630f3802716be433f4d2c6fc2f8c771add9
font_01_sfnt_off0000e9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A4 16384 bytes
SHA-256: dd084472304ff3e00ecea347f3b163be14ab50e7b905626460dc272d267b8425
font_02_sfnt_off0001142f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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