Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ce83bc39c9e069…

MALICIOUS

PDF

67.6 KB Created: 2020-11-12 21:59:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6c0df00e8b9b006867e246fd8b9fa530 SHA-1: 1e6f806f52c7fe857457b4969af7a1f6e7d1edd1 SHA-256: a5ce83bc39c9e06975cadcf5616a5bf398033372c2afa0725f9854e025127c1a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. The heuristic 'PDF_SEO_LINK_FARM' suggests a tactic to artificially inflate search engine rankings or distribute malicious content through a network of linked PDFs. The embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/aws?utm_term=certificate+of+recognition+template+word PDF link annotation
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/622ff218d14.pdfIn PDF document text
    • https://tiwotutekog.weebly.com/uploads/1/3/4/7/134722077/genix.pdfIn PDF document text
    • https://topagolidokade.weebly.com/uploads/1/3/4/5/134502990/507941.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427104/normal_5f99c6d6c2b56.pdfIn PDF document text
    • https://womurozini.weebly.com/uploads/1/3/4/5/134507066/b2244.pdfIn PDF document text
    • https://tifobavojosimiz.weebly.com/uploads/1/3/4/5/134505066/bffb8a3a421bb57.pdfIn PDF document text
    • https://wawukonuxoni.weebly.com/uploads/1/3/4/0/134095992/9242366.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/e858fa4e-be6c-4499-899a-c4bbcad7e595/survival_heroes_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/matura_angielski_gramatyka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc25f223-d863-4b70-91f2-b40b555794d7/india_vs_england_live_streaming_channel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c0f2f2c-a5c9-4f6c-a73d-7ab03b8a3140/40893228211.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af1a89f4-91e8-4eef-b65e-c85ce82f4376/packet_tracer_8.2.1.4_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/tatezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/194b3acc-3cbc-4ead-9da7-b5f78fac6d0b/47248719547.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_off0000cd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD91 5292 bytes
SHA-256: 2eadc69a0b30ff25226d688c5bc12999ce7edb68c51eb590b5acc1ac1b1b1adf
font_01_sfnt_off0000df8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8E 9928 bytes
SHA-256: 3aa42c912a6b5cae3b873e87637589ed8d5b671755559a7656dc30f3b3814bd2

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