Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ab23ce3fd0bfff…

MALICIOUS

PDF

126.1 KB Created: 2020-12-16 19:10:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: be39b896c6507b878e587bb55e9142cd SHA-1: 5da08fc743ff420394fb93ca0f41e064c2a171be SHA-256: 88ab23ce3fd0bfff0a92c6cf68cfc2f0f56f454c135bc1f69e7ad210436806db
214 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, 'traffine.ru', which is indicative of phishing or malware distribution. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to a wiring diagram, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • 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://traffine.ru/strik?utm_term=1978+puch+maxi+wiring+diagram In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378404/normal_5fa22dce4162e.pdfIn PDF document text
    • https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/pitinoxamejutuw_ziwodafurox_pixawalubifesej.pdfIn PDF document text
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/2676791.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4b2614a1-d85e-41fd-a472-e676d52a5701/91443942028.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/hr_strategy_document_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2a5f5d9-9bd8-4f60-9d7c-a346310cb69c/good_th9_bases.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e04e0567-9ff7-40cf-8355-c318e5c1bbb6/69390980290.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78b9fec3-bc51-48d5-bfa6-b81d7693c0ea/vujemaravux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/112ac010-2a93-45b1-8e6d-a84d750c1704/20495383285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c9ac440-a5f5-496b-a1c3-923781abbc79/caesar_civil_war_book_3.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/answers_to_the_impossible_quiz_2_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/del_norte_sheriff_inmate_log.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://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_off0001789d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1789D 5396 bytes
SHA-256: 3b8539152b0dfbdb35566dca9eea130b80df6194d2ac2892fedaf4721c10af0b
font_01_sfnt_off00018ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ADA 11888 bytes
SHA-256: 589a56b775c1b12d1d161f6144458f946af249d06820349c2fa3b6f1f59e17b8
font_02_sfnt_off0001b2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2C4 23724 bytes
SHA-256: 0025524e5a9673ffb3e277f638145b40fca228d534d2a30c05d00b4cdb2eda52
font_03_sfnt_off0001dc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC81 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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