Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e05fad3a85bdb6…

MALICIOUS

PDF

63.4 KB Created: 2021-02-14 16:40:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: c802cdbbe5830b9d042a52b9907f1357 SHA-1: 98b7672c052a3709faebdb7004989aee7f4f5c20 SHA-256: a3e05fad3a85bdb666cb824cdc8696eb1ea496a78574ddf8e875c4a1d4d485cb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains numerous external links, many of which point to SEO-optimized PDF files hosted on various domains. The primary lure appears to be a free download, indicated by the 'free-download phishing' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded links and the nature of the heuristics point towards an attempt to redirect users to malicious sites or download further payloads.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://leonvi.ru/123?utm_term=destined+for+the+throne+by+paul+e+billheimer+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384650/normal_60010518b269d.pdfIn PDF document text
    • https://cdn.sqhk.co/makubeku/hY9jck9/ttc_streetcar_driver.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371786/normal_5fdcc8c6830c5.pdfIn PDF document text
    • https://cdn.sqhk.co/furikute/Hebigif/ring_toss_american_ninja_warrior.pdfIn PDF document text
    • https://koxawobe.weebly.com/uploads/1/3/4/5/134528326/4670144.pdfIn PDF document text
    • https://sidugavumudoriz.weebly.com/uploads/1/3/4/9/134902227/d2b6a3ab.pdfIn PDF document text
    • http://yewes.fun/exemple_de_cahier_de_charge_d_un_projet_informatiquejgfl1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366040/normal_5ff7ca16d9fde.pdfIn PDF document text
    • https://posuzelivoj.weebly.com/uploads/1/3/4/8/134869480/3c8152a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368975/normal_60034e37d0a1c.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/eOoCijJ/world_war_2_movies_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/hMghphc/car_hill_game_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478683/normal_5fe16f4832173.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503617/normal_5fc8dd19b0533.pdfIn PDF document text
    • https://nolelagisumo.weebly.com/uploads/1/3/4/1/134132353/2556351.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ba94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA94 5520 bytes
SHA-256: 06289fc2c1e140c3cb699aab71a836fb94c2262aa874acd3aacdb9d9ce30b64d
font_01_sfnt_off0000cd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD32 10356 bytes
SHA-256: 5c77792284f160f2143b56753185c2dfc65211e7ab4a607b9f7f3c5fa3c76701

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