Malicious PDF — malware analysis report

Static analysis result for SHA-256 4373a6d2e3d5b5a5…

MALICIOUS

PDF

81.5 KB Created: 2021-01-23 06:27:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 02d278f00c3abe1165e645fde5a73ab5 SHA-1: 8a0a634018fa275c065162c9d45fc7af1f3d64d1 SHA-256: 4373a6d2e3d5b5a5840ebb1a1518da90686ced64ea01146bc391d7c9d308ce7b
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for a redirector link to 'traffmen.ru'. The ML classifier also assigned a high probability of maliciousness. The document contains numerous embedded links, many of which point to disposable hosting or redirector infrastructure, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of malicious links indicates an attempt to lure users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=probability+mass+function+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4491705/normal_5fdd09a71f673.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/JMa0oid/chris_young_playlist_all_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/kapideto/Piejbjb/ruzekopokerevajogopo.pdfIn PDF document text
    • http://wusodopepufex.66ghz.com/ristoranti_formentera_bocasalina.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://pogifovemujure.epizy.com/25182290114.pdfIn PDF document text
    • http://suwuxuk.epizy.com/harlequin_historical_romance_submission_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/bekhayali_mein_kabir_singh_ringtone.pdfIn PDF document text
    • http://lekazukexofa.rf.gd/mepebadomozolevuno.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/answers_hq_fifa_20.pdfIn PDF document text
    • http://regipikiwubadov.epizy.com/hepatitis_b_guidelines.pdfIn PDF document text
    • http://pawekixezad.epizy.com/adverbial_form_meaning.pdfIn PDF document text
    • http://volajigatume.epizy.com/7930931399.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/nakuxebale.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD689 5544 bytes
SHA-256: cc4fc10b1216b2312dc3a9b52366ef12b9957c7fd8e46df6680718a04eb51ad1
font_01_sfnt_off0000e946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE946 6148 bytes
SHA-256: 149738eb3e1d0bfb4a5732e89a115965e6f0cf3fc4971c694d3ce3619176544d
font_02_sfnt_off0000f925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF925 11848 bytes
SHA-256: fcb640f6702192463f8a5532f047e01e2a7df27315a7deac890858e81ed7a1f0
font_03_sfnt_off00012219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12219 16404 bytes
SHA-256: 9da4c89ddb49e38fa282242896dfd5877599bb73351d67a9edd8d53415a02269

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