Malicious PDF — malware analysis report

Static analysis result for SHA-256 92bc4bd5f2c69d6c…

MALICIOUS

PDF

69.4 KB Created: 2021-01-06 16:14:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 25360949681d491da200d0bf77ab2d60 SHA-1: 93f8a42495543e4d2d8c991779cad8e368269b99 SHA-256: 92bc4bd5f2c69d6c12d46af05eab748aff26e28d5a494f3c147d4013acad008d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, a technique often used in phishing campaigns to redirect victims to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to facilitate the download or redirection to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffnew.ru/aws?utm_term=ah44e+hall+effect+sensor+datasheet PDF link annotation
    • https://pozosukezogi.weebly.com/uploads/1/3/4/3/134386022/20284ac9da621.pdfIn PDF document text
    • https://cdn.sqhk.co/nebuwaxisiw/cigEEii/human_fall_flat_free_unblocked.pdfIn PDF document text
    • https://fivoputan.weebly.com/uploads/1/3/1/4/131408393/6487188.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/igqOij6/74870713529.pdfIn PDF document text
    • https://nimaxosonoj.weebly.com/uploads/1/3/4/8/134897368/xesotojisezura-mepob-tuvem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401723/normal_5fbd23c050e04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464850/normal_5fba7f3391309.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/5jcgeOC/fudosununazopisupon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366319/normal_5fbf77f557fea.pdfIn PDF document text
    • https://cdn.sqhk.co/zubuwebofe/hbidcjh/tip_top_shoes_coupon.pdfIn PDF document text
    • https://cdn.sqhk.co/notudubugu/Mghifjg/the_war_of_genesis_battle_of_antaria_review.pdfIn PDF document text
    • https://datokusowijodo.weebly.com/uploads/1/3/0/7/130776434/legag_weredaj_sofeve.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/df126864-5909-464a-9a5f-f4f20ef077da/piwibogesafunejik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b87898f-ac3b-4fc5-8629-3c6111f27489/burnt_ridge_nursery_catalog.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_off0000c5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F7 3904 bytes
SHA-256: c3e5e1f57336129f5e45ab470e66e466ea8fa243d744175aa47c6c506f9e929a
font_01_sfnt_off0000d3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E3 5184 bytes
SHA-256: da50a575b4662cb7bdafa72e8d6ec425f13b2203b3c9934c3795e5dddd14ea3d
font_02_sfnt_off0000e587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE587 10096 bytes
SHA-256: 7149e406a38a3accd4bde737df821840724ee29e02f2a890714727bf0742e4e1

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