Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9b541b8ec1dfbb…

MALICIOUS

PDF

111.9 KB Created: 2021-05-08 19:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e269c22f77a211979b196caa4f66d683 SHA-1: a2c44d7ce75bbcb860f2076451f8e1daba67311d SHA-256: dc9b541b8ec1dfbb62f0b1f6da5511d093e49c126d90680e4b24dec2242bd4bb
204 Risk Score

Malware Insights

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

The PDF contains multiple external links, including one that acts as an SEO redirector, and a heuristic firing indicates a link farm designed to lure users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and does not provide clear instructions, but the presence of a 'download button' heuristic and the overall structure point to a deceptive download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/strik?utm_term=mcculloch+pro+mac+610+chainsaw+fuel+mixture PDF link annotation
    • http://feelslike35.com/71315422103czitu.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/NVZwPhh/hang_glider_not_strapped_in_switzerland.pdfIn PDF document text
    • http://muzoc.xyz/webuzekoz7fdt3.pdfIn PDF document text
    • https://cdn.sqhk.co/kulamogo/giCoz0Z/36566826025.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/iNhiF08/37623986301.pdfIn PDF document text
    • https://xotizirew.weebly.com/uploads/1/3/1/8/131855992/a65518155835ba.pdfIn PDF document text
    • https://cdn.sqhk.co/linewebozid/ihhgOoe/kezugekadiruviparas.pdfIn PDF document text
    • https://cdn.sqhk.co/sisalubitot/1g3AhdO/fefujifovo.pdfIn PDF document text
    • https://cdn.sqhk.co/kefiruge/jbEIiea/30370506896.pdfIn PDF document text
    • https://cdn.sqhk.co/nimotixalulo/s2fhcij/thoracic_surgeon_definition.pdfIn PDF document text
    • https://wojuguzibuliru.weebly.com/uploads/1/3/4/8/134896427/2e410275fa3bf1.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/patologia_bucal_librocu07i.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/genijusemu/20915608595.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/what_to_do_when_your_acer_laptop_doesnt_turn_on.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/59989420009.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B0F 2952 bytes
SHA-256: cb9072f881c1fe0ad8900bbcc5a20a23fabb306412f64e001cac76c2a9509f2c
font_01_sfnt_off0001759e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1759E 5768 bytes
SHA-256: 0a39b413841e9c65a7ed02273e8f891df1a3abf8bcabb229eeaf2852562f7622
font_02_sfnt_off00018933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18933 11960 bytes
SHA-256: bb3ac6bcb2b2cb8f3a79fbbc81b0ce8dc4523cdd46d001a365106422fb6147e0

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