Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67756f8374f6382…

MALICIOUS

PDF

133.3 KB Created: 2020-11-13 16:00:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b7bc90ea924f5179df6a1dea52ecbd89 SHA-1: e11d1e8229edb2ba012ed14cd02010d1885ac548 SHA-256: f67756f8374f6382b4f9cebc42a23190a550a350891932a661a506a3277479ca
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links pointing to various PDF files hosted on disposable domains, indicating a link farm or SEO manipulation tactic. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier output further confirm its malicious nature, likely as a phishing or trojan distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffi.ru/123?utm_term=stern+introductory+plant+biology+lab+manual+answers PDF link annotation
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/sodokazid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385014/normal_5fad594b02152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368736/normal_5f8c7fe189756.pdfIn PDF document text
    • https://sokazavuse.weebly.com/uploads/1/3/1/3/131378988/lupiwizudijelit.pdfIn PDF document text
    • https://wesemijotabiwa.weebly.com/uploads/1/3/4/6/134622043/6628368.pdfIn PDF document text
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/sokurinom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471083/normal_5fa5ba59642a1.pdfIn PDF document text
    • https://pibemalogodozod.weebly.com/uploads/1/3/2/6/132681910/046d0f37.pdfIn PDF document text
    • https://segapokepex.weebly.com/uploads/1/3/4/6/134649200/0789322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_5f96e16b2ced2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371495/normal_5fad9548a81a9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/jogisifafiwalurujos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3469f625-3875-4fbc-ba93-a3a4a32e580a/wasusimibenanemok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dbc4691-f6aa-4044-b084-8a3b88206140/lujerajelam.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/31041149779.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB0B 5832 bytes
SHA-256: 327c1c16dad582e10c0f933140c10ccc1b3f4ea8da703069c4bef5f4c96cde53
font_01_sfnt_off0001dee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEE1 12120 bytes
SHA-256: bdca89e74a516bc4c6791f2b33d6fd8838763179ecadf2fbbd7ae1ea629a2c80

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