Malicious PDF — malware analysis report

Static analysis result for SHA-256 144b6a244029fbc6…

MALICIOUS

PDF

81.1 KB Created: 2021-05-18 01:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a73c34bfd594aba6703ec60b395d92eb SHA-1: 2db6c0b582f51391b4eb8eb8a3a09de53b0aef57 SHA-256: 144b6a244029fbc683e8edda188ba1b3bb5e7b8daac04e08fd90697f7a328153
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://ponafet.ru/strik?utm_term=responsibilities+of+assistant+front+office+manager PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376849/normal_6029dc1932c1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478415/normal_6026e02faa717.pdfIn PDF document text
    • http://wevaranozobe.iblogger.org/63496690115.pdfIn PDF document text
    • https://fujepibipaxider.weebly.com/uploads/1/3/1/0/131070521/2689440.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417669/normal_6014915397e82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471085/normal_60470149b0eab.pdfIn PDF document text
    • http://tevereze.22web.org/bavat.pdfIn PDF document text
    • http://wabefovelixi.66ghz.com/vimibokiva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401555/normal_6020fd2c29f6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_600f4808e5f01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380079/normal_6014073ad821c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414873/normal_60021843972f2.pdfIn PDF document text
    • https://laxuruvu.weebly.com/uploads/1/3/1/4/131482832/ebb2ad42d2d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380531/normal_601a7e70ad960.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wijuromosumeko.rf.gd/59614078707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/066fcba7-158c-4e18-b648-e9422a221ca6/what_does_the_head_of_a_pimple_look_like_in_pregnancy.pdfIn PDF document text
    • http://kevatudoritek.rf.gd/78887470871.pdfIn PDF document text
    • http://koxepari.rf.gd/zofusipuwatax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/231f96a8-e9d6-4e02-a3a3-e1e9fbbffdf5/wakinezunal.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_off0000fec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 5484 bytes
SHA-256: b601b54e30f6c0171e375bb71dbd17b1683910adb5b14f1bfe13fb22b8c06ed4
font_01_sfnt_off00011154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11154 10956 bytes
SHA-256: f89c56e7a065eee22a2e2dcd3adce207b03b1e629ad572e0746bf26093ee514e

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