Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a204a3eb6c9a183…

MALICIOUS

PDF

84.7 KB Created: 2020-12-30 06:33:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b6fc3b8ccd69cb2485e897b10b29f6d7 SHA-1: 16fc6b08de413821c9b0ba554ed7c74fbb5a6e43 SHA-256: 9a204a3eb6c9a183eebba735a9827e802a629ef9b0e315588724f54d66fe40a1
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a redirector link farm and a phishing trojan. It contains numerous links to external websites, many of which are hosted on disposable domains, suggesting an SEO poisoning or link farm attack. The primary malicious URL identified is https://gettraff.ru/123?utm_term=volumes+of+solids+of+revolution+worksheet+with+answers.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=volumes+of+solids+of+revolution+worksheet+with+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4447085/normal_5fa5f7121fda2.pdfIn PDF document text
    • https://kibirurifawejax.weebly.com/uploads/1/3/4/6/134610443/xomamub_zofedoliz_dexinekezofi.pdfIn PDF document text
    • https://rivebopufu.weebly.com/uploads/1/3/4/6/134663658/wedugujexali.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/8379015.pdfIn PDF document text
    • https://zerorobasajegi.weebly.com/uploads/1/3/4/7/134751736/2922425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_5fe6413aebbe8.pdfIn PDF document text
    • https://wopedibim.weebly.com/uploads/1/3/4/5/134585971/jinebagotuzeko_gokat_dagopisukufik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476766/normal_5fc135df7de1a.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/370b3a54-292e-4b7b-b1f5-40e8caf44eba/412234598.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/clash_of_clans_new_update_2019_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17630149-4435-4f0e-a4f4-8f8c1c5352f3/mini_cooper_r57_service_manual.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_off00010b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B97 5328 bytes
SHA-256: a0614d57d80d6cc950654e470766663e7b12489b89055bb8765378b00fb03db3
font_01_sfnt_off00011da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA1 11780 bytes
SHA-256: cd1459c28d1a5de61e86a873ea053e48eb500ff692067be3f01e900cb9847e89

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