Malicious PDF — malware analysis report

Static analysis result for SHA-256 777b96a116756398…

MALICIOUS

PDF

65.7 KB Created: 2020-12-18 14:07:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a1654f52ef8616828118dd8342e0ae36 SHA-1: 5d7d4a5d6d55be160ab3ae9947663ae91f137465 SHA-256: 777b96a116756398d14c148062f42939db86e585a00c83af5021d0ccef7a0ecf
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, suggesting an attempt to manipulate search engine results or lead users to malicious content. The ClamAV detection and ML classifier further support the malicious nature of the file.

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://gettraff.ru/wb?keyword=elder%20abuse%20reporting%20oregon In PDF document text
    • https://xomivevisavuwog.weebly.com/uploads/1/3/4/8/134852088/fajagad-gariru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403276/normal_5f99096d1fe8c.pdfIn PDF document text
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/zodinedobi.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/najob_tefuzogi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_5fdbbc4638695.pdfIn PDF document text
    • https://vozexipazaxa.weebly.com/uploads/1/3/4/4/134444785/vaguxaporoxewik.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/fifomavi.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/5fc2fe30abaecd33182fe85c/t/5fc9b72d196a600d3c2fd0c9/1607055151274/photo_finish_horse_racing_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/trinity_school_leamington_spa_uniform.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc29ae41c8c7413143cd114/t/5fca25d8fedaa13a486aea6a/1607083480863/53907660940.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/not3s_addison_lee_song.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/brazil_theme_song_2018.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_off0000c580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC580 5224 bytes
SHA-256: 2ce7ee0804ac1a2f51000ab0d904d38778cbf8b56072c1d8271ef04a2002cf8d
font_01_sfnt_off0000d74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74F 10168 bytes
SHA-256: 1ceeed500b576dd38966d42ede87156f52e3c49b3a2117f488ca20c02f4ef87f

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