Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a5dda4b6b86efc…

MALICIOUS

PDF

78.7 KB Created: 2020-12-28 12:48:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: babd61f400c95e18ead52442a2b2c886 SHA-1: d2110412f8342d904ebbd9d55e9f730f05ad1c6d SHA-256: 88a5dda4b6b86efcd194fd8339ec905e423d90afb02a0dfbcec42e6a7b215f7a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning and phishing. The embedded URL 'https://traffnew.ru/strik?utm_term=chicago+cubs+score+today+espn' suggests a lure related to sports scores, aiming to trick users into visiting a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojanized document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/strik?utm_term=chicago+cubs+score+today+espn
    • https://static.s123-cdn-static.com/uploads/4487916/normal_5fcc8d0e13a09.pdf
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/gizosarog.pdf
    • https://cdn.sqhk.co/leburogutu/djWihib/free_online_music_making_software_for_mac.pdf
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/9007198.pdf
    • https://zegaxazidunuxe.weebly.com/uploads/1/3/4/7/134746987/metoxazod_lepadedoxij_valarum_logiziva.pdf
    • https://vufevilasok.weebly.com/uploads/1/3/4/3/134314299/tibijivedopofonum.pdf
    • https://wumunelopilum.weebly.com/uploads/1/3/4/3/134395902/pesemufofikusom_kumixa.pdf
    • https://cdn-cms.f-static.net/uploads/4454422/normal_5fafd36c25e19.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/703f3910-6753-4e02-8ab6-c2533c85587f/kirovilagogejikululonako.pdf
    • https://uploads.strikinglycdn.com/files/ad66ed0a-d7f7-4c69-80bc-8a6c01c8482e/28539159624.pdf
    • https://uploads.strikinglycdn.com/files/e884be5b-75cd-4261-bf10-dc4a462f621e/wood_pc_case_diy.pdf
    • https://uploads.strikinglycdn.com/files/ad06b09e-67b1-4c40-89df-afddae60fe01/tokyo_drift_mp3_song_download_mr_jatt.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc6.bin
26ba5c8d1583574648fd6e595d23dee3122ef52e1b97b4330dab96c4d4c4123d
pdf-font-stream PDF embedded font (sfnt) at offset 0xECC6 2888 bytes
font_01_sfnt_off0000f709.bin
140f9cc43efa23c264e3081d9b8e90555f0ebd9ac363af820b19a92c883598ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xF709 5448 bytes
font_02_sfnt_off00010987.bin
7bb24ada2fba37227f8acd8642882c036d212a7f010011c0ac754859b14b17dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10987 10600 bytes