Malicious PDF — malware analysis report

Static analysis result for SHA-256 8018fa7f3bac3247…

MALICIOUS

PDF

70.2 KB Created: 2021-03-28 05:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd85d5aefba40d91877c579dd4cc7443 SHA-1: 3049fb2a07844a1b6b42e09ed1150d9935814522 SHA-256: 8018fa7f3bac3247860f2f0809daa2a3e041f24767c56c07ab3dfbefa04ad306
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is part of a link farm and hosts external URIs, with one primary URL being suspicious. The document body, though heavily obfuscated, contains text related to "7th grade math minutes" and the wkhtmltopdf application, suggesting a lure. The presence of external links and the overall structure point towards a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/award?keyword=7th+grade+math+minutes+pdf
    • http://arm-watch3.club/2463599089219xb9.pdf
    • https://cdn.sqhk.co/zixapegof/jbcAMhc/counting_1_to_10_worksheets.pdf
    • http://coupons2020.info/kekimoxubepiwovoph6v4n.pdf
    • http://probmake12.xyz/lenovo_t400_bios_beep_codesidu0v.pdf
    • https://cdn.sqhk.co/zotofoza/icUidXy/vumezovogegujirukodi.pdf
    • http://originalhallyu.com/hp_officejet_pro_6830_software_for_windows_10arbnr.pdf
    • http://mydenverneighborhoods.com/nutritional_information_pringles_sour_cream_and_oniongwf1k.pdf
    • https://cdn.sqhk.co/wajidafix/Xsxjdgc/65095620514.pdf
    • https://cdn.sqhk.co/xupodafib/ghXhcjd/fowitefagonemad.pdf
    • https://cdn.sqhk.co/puzadowoke/ji3kJhj/tibemuwisowigifelasado.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2ae8fa2d-8b21-4cd7-bd94-b44763fb9b4d.filesusr.com/ugd/8e1ec7_ba91710b791744778e5e57d2ed5bb130.pdf?index=true
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_721970bdca0e4bb0838e525044be9de9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/02aa3508-064e-41e4-8d2d-4f8259ee7efb/6912379378.pdf
    • https://uploads.strikinglycdn.com/files/f256cd06-59b5-4128-a5c8-6a1094a30fae/27678374178.pdf
    • https://uploads.strikinglycdn.com/files/af67643c-3846-4e1b-b508-f2213e394d2e/what_does_fanatic_mean_antonym_and_antonyms.pdf
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_945b12ccfc2f4b79ae487cd5993e7d6f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2a68e6f5-00ab-4d39-ad62-31713994e70a/82295014861.pdf
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_30242285e7364fc4a73a330eb9129f2e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c288106c-6c2f-4aa8-b179-992d97bda576/32685502661.pdf
    • https://000bb656-a8cb-4e8b-9327-0b0ec99f56fe.filesusr.com/ugd/3f812e_dfd42b37b3bc4c66aae5cb2c70c43c5d.pdf?index=true
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_335d92a70138428499b6828865635a7c.pdf?index=true
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_9e10d3bfd5244abcb3770c7925291319.pdf?index=true
    • https://a26b494c-4f54-4b9d-aaa3-e02d462d315a.filesusr.com/ugd/c6268f_cd54800fdba148d9bfc00aca2cca870e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d40b.bin
93eb175c3d94067b8725923719d624a02d00e98be3cd9d7c3aad30ee09c9fda1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD40B 5408 bytes
font_01_sfnt_off0000e64b.bin
fa87bf67a832615f0d3acf7e784223105e702661dc93adeb148cab0d426777cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE64B 10780 bytes

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