Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bc36af5fc860a3…

MALICIOUS

PDF

83.7 KB Created: 2020-12-13 14:48:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 884df74662bda21ffc8e9806c65c60b8 SHA-1: 7e895dd2ad5cd106dcb6736f9937c32cbd390c82 SHA-256: 87bc36af5fc860a3c9b27b2c498fa662892dfdc9124f134e391213393407fb2f
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'traffine.ru'. It also exhibits a PDF link farm heuristic, indicating an attempt to host numerous external PDFs. While no scripts were extracted, the presence of malicious links and the overall structure suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=minority+meaning+in+application+form In PDF document text
    • https://xijonezamo.weebly.com/uploads/1/3/1/4/131407630/betujo_nigoj_kixazekulibebe.pdfIn PDF document text
    • https://wetivaxidufe.weebly.com/uploads/1/3/4/8/134891283/pojozife.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/vaxukekiwurefebe.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://s3.amazonaws.com/xatojem/everstar_air_conditioner_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/biomateriales_compuestos.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/best_castle_building_game_android.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/turorefug.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/circle_of_fifths_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/hard_algebra_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/18401692818.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/24659116921.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/building_plan_design.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/bike_race_mod_apk_ultra_bike.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB55 5052 bytes
SHA-256: be3017270f84170fb2b4b40ae126bca608697ec99449f2e629b43c81694df101
font_01_sfnt_off00010c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C70 11892 bytes
SHA-256: e9f7896e9d97951b3542062b718852d235e5f61073cc6db59bbb916d833c39f0
font_02_sfnt_off000133de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DE 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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