Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4abdb8e312d224f…

MALICIOUS

PDF

71.6 KB Created: 2021-02-23 23:19:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8f05433912e92e6730239d16a0e29818 SHA-1: 78d7ec9d5a2d0fc5289f59119965c94ae3812434 SHA-256: c4abdb8e312d224fbb68a720eeea5ac858911f7da8b023384190f7a5a4909dec
244 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector and a link farm. The embedded URLs, such as 'https://crophysi.ru/strik?utm_term=lake+nipigon+campground' and numerous links hosted on disposable domains like weebly.com and sqhk.co, strongly suggest a phishing or malware distribution attempt. The presence of these links indicates the document's primary purpose is to lure users to external, potentially harmful, resources.

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://crophysi.ru/strik?utm_term=lake+nipigon+campground In PDF document text
    • https://tisawotaw.weebly.com/uploads/1/3/5/9/135993845/fuliwagukilup.pdfIn PDF document text
    • https://cdn.sqhk.co/rovonoset/gfjhiic/15609514301.pdfIn PDF document text
    • https://najoduvojubowi.weebly.com/uploads/1/3/2/8/132815002/50136.pdfIn PDF document text
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/582685.pdfIn PDF document text
    • https://cdn.sqhk.co/noligigibar/g6jhhe6/54785062580.pdfIn PDF document text
    • https://wuwebiwurumebil.weebly.com/uploads/1/3/1/1/131164488/4d9791.pdfIn PDF document text
    • http://makamar.xyz/81252390030tid7f.pdfIn PDF document text
    • https://cdn.sqhk.co/nukebomevobe/jeFMh21/tulawufigireg.pdfIn PDF document text
    • https://rekozoweno.weebly.com/uploads/1/3/4/3/134364890/1a64d56f442c.pdfIn PDF document text
    • https://ginugifugebiner.weebly.com/uploads/1/3/4/2/134234672/4158331.pdfIn PDF document text
    • https://cdn.sqhk.co/fofotixoz/idXhdWp/vidawiboxawop.pdfIn PDF document text
    • https://fozogefijegajor.weebly.com/uploads/1/3/1/4/131453134/vilodibunazaj.pdfIn PDF document text
    • https://cdn.sqhk.co/tuponapalab/pcijfha/dadupoda.pdfIn PDF document text
    • https://katibaluzopoxu.weebly.com/uploads/1/3/0/7/130738884/lataveb.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/suzujewa/94793309888.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_off0000d75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75E 5188 bytes
SHA-256: 7aaf5d0b77bd792175e51f437dd8938e52ff6cb0a62a501a32f850957806da87
font_01_sfnt_off0000e8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 11348 bytes
SHA-256: 33b52f0cc1ad8e92bca90ea975c8323235a396d5638c9a8d78213342ce9248eb

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