Malicious PDF — malware analysis report

Static analysis result for SHA-256 977655a3126ed0e7…

MALICIOUS

PDF

79.3 KB Created: 2021-03-26 00:53:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4fb7ccb4ac9fb529dfc81af43442aad9 SHA-1: 244bafb0b8971efefe05aef27d9324e9821ded98 SHA-256: 977655a3126ed0e759f2fa3f22d134f54955618bc7eba03eb3ddd9c35a6ade54
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of a URL with a 'utm_term' parameter indicates a potential phishing or scam lure, disguised as a digital marketing course. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the phishing and potential malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/strik?utm_term=melhor+curso+de+marketing+digital+para+afiliados PDF link annotation
    • https://roxomikanu.weebly.com/uploads/1/3/0/8/130873860/zirinu.pdfIn PDF document text
    • https://vuvogotekepuma.weebly.com/uploads/1/3/0/7/130776629/kakovomejelulaxawol.pdfIn PDF document text
    • https://cdn.sqhk.co/suxepemup/gphgahb/history_of_the_universe_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/wularumijif/hg2lhg8/bezegonoxivokepumag.pdfIn PDF document text
    • https://sefubokadizafa.weebly.com/uploads/1/3/4/8/134880044/537838.pdfIn PDF document text
    • https://cdn.sqhk.co/gabamulijawe/jhje2hd/28187439493.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/cidS7st/campground_with_water_park_in_florida.pdfIn PDF document text
    • https://rupedotumimeto.weebly.com/uploads/1/3/1/4/131482941/rapowibo.pdfIn PDF document text
    • https://nuzepobijane.weebly.com/uploads/1/3/4/8/134885792/1267471.pdfIn PDF document text
    • https://tagesokute.weebly.com/uploads/1/3/5/3/135315496/f9c65dc978.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/3f41b824-2bf5-4131-ba44-a2fae9994ac7/bassham_critical_thinking_a_students_introduction_5th_ed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abc341b0-5f09-436c-9ce4-339f83bba779/12517778371.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b548b176-060e-48f5-a075-a5d6834a595e/wazejugelajibunirav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bf11eae-8684-41da-b938-6f8e00850e95/vajisakifimofiguro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74e38171-0140-4132-b9ba-1275ba2661c4/4992198193.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_off0000f5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DA 5640 bytes
SHA-256: c6475872ad71e2ddebac28c4db31fc543623fd5b10023a3b872b315b516bf769
font_01_sfnt_off000108f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F1 12968 bytes
SHA-256: abbb7d75d4923e04768b02ed5444bea52a93de79ac07f0299c2f4b1ca6bc5e84

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