Malicious PDF — malware analysis report

Static analysis result for SHA-256 54db069f55ffe8fb…

MALICIOUS

PDF

89.0 KB Created: 2021-05-29 15:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: c02f658c0ff2df8dad5528e1cf201408 SHA-1: dc713e4144f2209a0cc795ef71af4ad74f941a3d SHA-256: 54db069f55ffe8fbd54995f8de810c2bfa6f90b0287be377fdda58abb7c975f5
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, appears to be a lure related to academic material, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://vilenefex.ru/strik?utm_term=introduction+to+management+accounting+sybcom+semester+iii+mcq PDF link annotation
    • https://labomozojaxige.weebly.com/uploads/1/3/0/7/130738499/nefatudugidi-wiwovavewo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_60433e925daf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493245/normal_6065f493349bd.pdfIn PDF document text
    • https://nawigabijaku.weebly.com/uploads/1/3/4/5/134599080/1191e5ee8cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490974/normal_601fc3e5b7904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494875/normal_60554602f2e2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482645/normal_606664dd6bfb4.pdfIn PDF document text
    • https://xaguverage.weebly.com/uploads/1/3/7/5/137513239/3483449.pdfIn PDF document text
    • https://reroweno.weebly.com/uploads/1/3/4/6/134687099/3736519.pdfIn PDF document text
    • https://kovapuneluwaze.weebly.com/uploads/1/3/2/3/132302913/9914977.pdfIn PDF document text
    • https://koxijarekaze.weebly.com/uploads/1/3/5/3/135326688/0c83f90a297e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/df5cb219-87c3-4a15-b091-ec98cef3c444/soundpeats_wireless_headphones_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e8df4a6-566c-48bc-987f-85a68b515b13/1774675576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e702fcd-bd05-4bb0-9c5b-2a184b244b7e/gutugorijapopavaxisabibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e962fa-5e5f-458f-9df0-b629138fcbbf/28444833663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63497515-c763-436b-bb84-ce0b241ce9b9/conversin_de_centimetros_a_pulgadas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c661600e-8b0e-4e9f-b894-600dffb27e93/firotesuzugobetabuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c251f1a-61ea-4e31-977d-777982267204/52324675960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6196da3-ab1a-4145-9fa9-e4588a781a53/moon_river_and_steel_city_color_street.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b57f1a5-395c-4996-a97c-5d837058cd70/81747261383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5edc6472-809b-41b0-a0dd-bb100b637518/polaroid_one600_classic_instant_camera_film.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/106cb2fe-032f-4927-8e7b-60f6ee62c13b/sony_str-dn840_av_receiver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3738e7bd-3918-4220-beaf-ca6156c61ab5/91520934055.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_off00011ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA0 5532 bytes
SHA-256: 0b772f109750e505b875fce9acb984a011276cd00b59a8244d0b3f19d35c1361
font_01_sfnt_off00012f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F52 11320 bytes
SHA-256: cb5b998af2de98a55cf32e18168ef4f300232c9ceeaa4b4b160998d9b805aac4

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