Malicious PDF — malware analysis report

Static analysis result for SHA-256 db56723800aa7f34…

MALICIOUS

PDF

72.5 KB Created: 2021-01-21 06:44:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 22385360ed7daaf83b8fdc743cb6761e SHA-1: 9831cf9ce2538d1343cbb35712b1d36c34f98c60 SHA-256: db56723800aa7f3448423991c54542c3aae9372e356e5df6b3667c290bbb8d7c
184 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and it contains multiple embedded URLs. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, specifically 'https://traffmen.ru/123?utm_term=breakfast+club+chicago+high+school'. Another heuristic identifies it as a link farm on disposable hosting. The presence of these links suggests the primary purpose is to redirect users to potentially harmful external sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffmen.ru/123?utm_term=breakfast+club+chicago+high+school In PDF document text
    • https://site-1173632.mozfiles.com/files/1173632/ximavovexenimonebisi.pdfIn PDF document text
    • https://site-1175553.mozfiles.com/files/1175553/biology_101_full_movie_free.pdfIn PDF document text
    • https://site-1176407.mozfiles.com/files/1176407/2090266423.pdfIn PDF document text
    • https://site-1168066.mozfiles.com/files/1168066/koat_tv_7_breaking_news.pdfIn PDF document text
    • https://site-1178770.mozfiles.com/files/1178770/69612000914.pdfIn PDF document text
    • https://site-1179767.mozfiles.com/files/1179767/heat_conduction_apparatus_experiment_lab_report.pdfIn PDF document text
    • https://site-1172565.mozfiles.com/files/1172565/jaxifagizunavim.pdfIn PDF document text
    • https://site-1168501.mozfiles.com/files/1168501/asuran_dhanush_bgm_music.pdfIn PDF document text
    • https://site-1176547.mozfiles.com/files/1176547/b__e__d_jacquees_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gevewodex.epizy.com/answer_sheet_pet_listening.pdfIn PDF document text
    • http://siwojanapav.epizy.com/80200552612.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/vogumoda.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/zititegapaxijegubedu.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/8240970180.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/50437611027.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/83701006025.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/lagenififizixat.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7B 5396 bytes
SHA-256: 7fbc00844962c38c071a013fbdc465c02fc117c0ac7ced65bc7b11df8240e3ae
font_01_sfnt_off0000eed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED9 11092 bytes
SHA-256: 155d942f51bf35e276351911d8eaf0bf1716e4497f8c5d9a16d842b471dbb5cc

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