Malicious PDF — malware analysis report

Static analysis result for SHA-256 19316245fe5fa05e…

MALICIOUS

PDF

68.6 KB Created: 2020-12-21 19:56:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 66723f06fb0a689326e5c265ef3daf7d SHA-1: 795ea6a078cb3e1bb47e0dbc691856d63a83e11b SHA-256: 19316245fe5fa05ea0be57ce94340cf0f71e0d178b310fdcc30fd504062a5ef6
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

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://traffine.ru/aws?utm_term=vikings+injury+report+against+bears In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416790/normal_5fab1cce6ff81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366362/normal_5f963a1fc9b28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402745/normal_5f9715f12f03d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374520/normal_5fe014a65e56a.pdfIn PDF document text
    • https://sererewaxux.weebly.com/uploads/1/3/4/9/134903335/xevikazarijigube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416928/normal_5f9e4d71ad231.pdfIn PDF document text
    • https://fusaxuwumave.weebly.com/uploads/1/3/4/5/134598556/958191.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412161/normal_5fcf340e25201.pdfIn PDF document text
    • https://bagolisenavela.weebly.com/uploads/1/3/4/4/134496394/xotazuxifiwuxaliluw.pdfIn PDF document text
    • https://jikubefu.weebly.com/uploads/1/3/4/3/134318914/e8fb8c7947d5.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/3a7abfa9-750b-4c3f-81b2-9c5751f2a74b/76013800908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97747337-bb4f-479f-894c-647b51523951/34736272059.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fe006135b7bc96605614f88/t/5fe0dccdbb3dbb3a40cc784f/1608572110685/platform_bed_twin_cheap.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd39d2109152533653190d/t/5fdd6ebd51a86c1b6c0d8e93/1608347330160/bmp280_breakout_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/18514027409.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_off0000cccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCB 5300 bytes
SHA-256: a2d20c1dcf731dfcdc0bb477cc9929f776a1aedb9ef7927e3a72a4ca227dc315
font_01_sfnt_off0000def2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF2 10700 bytes
SHA-256: 92a8fdad233d323562924f5fe623db0085fb2ff3eed442ea64c7c2b0f4bef5a7

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