Malicious PDF — malware analysis report

Static analysis result for SHA-256 276ab590fd22fe26…

MALICIOUS

PDF

75.7 KB Created: 2021-01-12 15:18:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 53a8f2c992308d2b84d7be67fd541cee SHA-1: a0874125a15df59ce2109b9c960b5d45670088d7 SHA-256: 276ab590fd22fe26593487b18548811297fb79488d506245334c69e7ff77629e
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagging it as a redirector link and a link farm. It contains numerous embedded URLs, with a critical finding indicating it links to known malicious redirector infrastructure. The presence of many external PDF links suggests an attempt to manipulate search engine results or direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/aws?utm_term=angularjs+format+date In PDF document text
    • https://cdn-cms.f-static.net/uploads/4449769/normal_5fd3d17d754c1.pdfIn PDF document text
    • https://bonunobomatujo.weebly.com/uploads/1/3/4/3/134318799/4973005.pdfIn PDF document text
    • https://site-1238581.mozfiles.com/files/1238581/degaxofawimanibidigafezu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369509/normal_5fbd64e96815b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445864/normal_5fc20063e4b6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464067/normal_5fceab1b4bffa.pdfIn PDF document text
    • https://sufimademum.weebly.com/uploads/1/3/4/2/134236216/1b68d3c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387919/normal_5fa5603e99443.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/vavapekadoliti/40563894870.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/59811592463.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/siwujasefoxusasegakobopex.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/82542171083.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD20 5292 bytes
SHA-256: f8c88ecbc146c1694d2cbee0f621e275c27bc01e24f5bd4f7cf2da575067c243
font_01_sfnt_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 2092 bytes
SHA-256: 13678a14b930e6d42e11b2ac41b13981c2c7f5938cc30cfb194ad51886f1f1dd
font_02_sfnt_off0000f8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 12072 bytes
SHA-256: b22be64a97fb1995569295728202ce25e9ebf55ab36fc6e89910c8bc8b2ba04a

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