Malicious PDF — malware analysis report

Static analysis result for SHA-256 6abd4137e10ca2df…

MALICIOUS

PDF

77.8 KB Created: 2021-03-21 21:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5aafb03a7b57e5c026223169b034fde0 SHA-1: 5f2d2c1b8a9f265f2f9deb3051fab9b505585a5c SHA-256: 6abd4137e10ca2dfe8cabbe6170b3737d1b2e60a237f6701405cdff124e9fcb6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, indicating it functions as a link farm. One prominent URL, 'https://resalured.ru/strik?utm_term=loving+and+forgiving+yourself', is directly embedded in the document's content, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=loving+and+forgiving+yourself
    • http://crawlmqyu.space/campbell_biology_10th_edition_dog1m5c.pdf
    • https://cdn.sqhk.co/nokikijun/ijXIehf/240sx_drift_tune_forza_horizon_4.pdf
    • https://kurinasuvofete.weebly.com/uploads/1/3/5/3/135334761/devul.pdf
    • https://cdn.sqhk.co/wipedekis/4IS6sja/stress_management_techniques_for_middle_school_students.pdf
    • https://static.s123-cdn-static.com/uploads/4387590/normal_5fc7c6985b800.pdf
    • https://static.s123-cdn-static.com/uploads/4380859/normal_5fe591daa27f1.pdf
    • https://static.s123-cdn-static.com/uploads/4476782/normal_5fc757230f4bd.pdf
    • http://zhenskiizhurnal.ru/crossfit_football_collegiate_programmingf0isu.pdf
    • https://cdn.sqhk.co/satidaruxami/0b39qjj/kohls_cash_days_2020.pdf
    • https://cdn.sqhk.co/xonipavu/fMjTiiK/save_girl_child_quotes_in_telugu.pdf
    • https://cdn.sqhk.co/tubawonidas/bRjflhc/egypt_old_kingdom_master_of_history_gameplay.pdf
    • https://cdn.sqhk.co/dubezaxuviz/Uic4InO/grossman_lumber_reported.pdf
    • https://lopufofogepuxal.weebly.com/uploads/1/3/4/6/134695200/bufozefozox.pdf
    • https://cdn.sqhk.co/potasuregoz/Uhiidie/kisurirulitobafa.pdf
    • https://cdn-cms.f-static.net/uploads/4482638/normal_6029fbb71dbe2.pdf
    • https://static.s123-cdn-static.com/uploads/4453532/normal_5fedbfa5f2f30.pdf
    • https://cdn-cms.f-static.net/uploads/4488101/normal_6019d553901f9.pdf
    • http://aycotoro7.xyz/shimano_xtr_di2_groupset_price_philippinesnkmsi.pdf
    • https://static.s123-cdn-static.com/uploads/4369643/normal_600159bd729a7.pdf
    • https://cdn.sqhk.co/dagosasojo/5hggeg7/tomb_raider_2_movie_cast.pdf
    • http://nutristrike-shop.ru/which_of_the_following_is_best_example_of_peripheral_route_persuasionq5tll.pdf
    • https://static.s123-cdn-static.com/uploads/4503987/normal_60040302c0aeb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4d3.bin
3e6bd1eb45aa17da5f5ef3c5604347879b82753cfe314361cfe4dc9043f05426
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D3 4980 bytes
font_01_sfnt_off0000f5d9.bin
e6c24b2c2e6c1b65400407e415e8955d88d475b54a957e71f3834e2a284d0e28
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D9 11076 bytes
font_02_sfnt_off00011bb6.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB6 4324 bytes