Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcdfd5a2575eeaf6…

MALICIOUS

PDF

69.9 KB Created: 2020-12-22 05:46:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6ac13380f03a66c4f7adbce7d226386c SHA-1: 232e141b8fec6d2134573dac3aad895df9cdebac SHA-256: bcdfd5a2575eeaf62cd26cf2fdb5ce38b3bafebab8f46425eab1dbb62031f7d8
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body text is heavily obfuscated and unreadable, but the presence of the malicious URL is sufficient evidence for the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=first+aid+quick+reference+guide+pdf In PDF document text
    • https://xugomijomib.weebly.com/uploads/1/3/4/5/134578432/95b43fe4b2d79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416502/normal_5fd03b6f6acb9.pdfIn PDF document text
    • https://pewixuzapama.weebly.com/uploads/1/3/4/6/134655392/vufok_karamujog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470024/normal_5fc1042cb7293.pdfIn PDF document text
    • https://rezizeme.weebly.com/uploads/1/3/0/7/130775554/d45c8eebd.pdfIn PDF document text
    • https://jorimedazaget.weebly.com/uploads/1/3/0/7/130738946/5d16cd4975.pdfIn PDF document text
    • https://gonoloxezejuje.weebly.com/uploads/1/3/1/4/131410007/7035760.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/kopiruzewivemubu.pdfIn PDF document text
    • https://numilobes.weebly.com/uploads/1/3/4/2/134235742/7737bec57b6847a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf2cdcc750a3b5a052d74/1606218447195/53239067534.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/97576594412.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/nogudokimumimorugotodide.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/mi_a1_android_10_alacak_m.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/1186232512.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1b53fc6229360ecb2a747/t/5fc52d8e18e72e5fdb7ed1f7/1606757777676/temperate_woodland_and_shrubland_animals.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/vinepuvute.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/pinofotofaxibewa.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_off0000d3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FA 5436 bytes
SHA-256: d429a87876bceea4c9e4e3fc0125ce30ec385fd3c0f677d7b4817a72919a5f54
font_01_sfnt_off0000e68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68C 10556 bytes
SHA-256: 741422be475986c7424ef6427da8bb8ec328eef0f2fc9e0c324edf60ea606ffe

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