Malicious PDF — malware analysis report

Static analysis result for SHA-256 54341674759b1789…

MALICIOUS

PDF

74.3 KB Created: 2021-02-16 12:18:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f93a87fd02892fb642b8c0fd4de1ce2 SHA-1: a439519ec17f0fd9519bc7ae3b4245215f1da1d8 SHA-256: 54341674759b178961ebb895d83ee5f899b5b1606f7b82b976dea0c8fd540b3c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=how+to+set+superheat+on+txv+valve
    • https://cdn.sqhk.co/xidodaxu/ietgvAq/97322874086.pdf
    • http://itravelimpressions.com/18362844057ggzs4.pdf
    • https://cdn.sqhk.co/nivatasob/aJgfpie/jawaxop.pdf
    • http://50offstore.info/tikererjmncd.pdf
    • http://skidki-day.site/xefajanpu8k5.pdf
    • https://cdn.sqhk.co/simunenij/ieMmTij/soxivegiwugezupawefegob.pdf
    • https://cdn-cms.f-static.net/uploads/4409814/normal_601d32c0009e1.pdf
    • https://cdn.sqhk.co/nibedogoxov/ghihX9i/e-_pluribus_unum_coin_value_1971.pdf
    • https://bujakisuka.weebly.com/uploads/1/3/2/6/132695398/mifagadeva.pdf
    • https://static.s123-cdn-static.com/uploads/4408343/normal_5fc67cca3e9d1.pdf
    • https://belijexulifowa.weebly.com/uploads/1/3/0/7/130738738/587e6c577eea4c.pdf
    • https://cdn-cms.f-static.net/uploads/4369179/normal_60276028cc293.pdf
    • https://cdn.sqhk.co/zetanitanedo/KHG0gdN/peace_equalizer_boost_microphone.pdf
    • https://cdn.sqhk.co/ribobujir/gia0SaI/genub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gotuzarodeg.epizy.com/math_9_answer_key_module_4.pdf
    • 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_off0000e54d.bin
4d667ed097e2f3382d322cec1548a91c3c40bdba741942b459d65c475ebdc11b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE54D 5088 bytes
font_01_sfnt_off0000f6aa.bin
b95fa8fca76eebb77e055144c5e1277e14cf7b4680525fd6fee10b25e2a8ae0d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AA 10900 bytes