Malicious PDF — malware analysis report

Static analysis result for SHA-256 f072234f939a186d…

MALICIOUS

PDF

79.1 KB Created: 2021-07-16 02:39:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 765c302e633881deed118a2f4d155ebd SHA-1: 9bd28862b3b1434245362707dea972723200fbdc SHA-256: f072234f939a186d1bac6ed2b671d90033859c68e72d68d646aef489cbb23eed
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF_SEO_UTM_REDIRECTOR_LINK heuristic indicates that an image within the document is designed to lure users to a phishing site via a redirector URL. While the document body is heavily obfuscated, the presence of these indicators strongly suggests a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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
  • 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/~3/4Ji06Fp1PxY/square?utm_term=pins+and+needles+in+arm PDF link annotation
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f083f2faec3a5c4dacb1ef/1626375154772/notice_of_quitting_letter.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7cc5380504e0a7768a958/1625803861367/bitatilipupik.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f0b01285f7e93384c8f678/1626386450498/domain_of_a_logarithmic_function_advanced.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edec2a10369373fd856306/1626205226137/impulse_of_force_is_equal_to.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8ab1b261b7f2579ab5a2e/1625860891935/fijimub.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec9eccc426b81e83025ad0/1626119884851/clothing_synonyms_in_different_languages.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee82e6db6052518eca4e35/1626243814898/52740319002.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f0a6acb2f3fd7b937a25fe/1626384044857/11632102897.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e91d77f492d21a0f6ac54b/1625890167924/dragon_ball_xenoverse_new_update.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD563 16940 bytes
SHA-256: 2af343bc28e9282a771f4c13f25f4597d8b76ebc2e3b878e78c7aaa4bf9098a7
font_01_sfnt_off000101b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C7 10192 bytes
SHA-256: 01bce8a74d3df723fcf6994b22f755589e70a6196f45fc393a9b76fb35ed282e

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