Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a83fba50d5a56e7…

MALICIOUS

PDF

74.5 KB Created: 2021-06-04 16:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 330cc36d396227fb3143f9405438a929 SHA-1: 5fd279994bf3944b3a940f01c7a59e26aad9f769 SHA-256: 6a83fba50d5a56e70849550e3eb93fae4e99c344c77fe8241b843711ace9b1af
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV heuristic strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pistant.ru/pbw?utm_term=fundamentals+of+thermodynamics+9th+edition+solutions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487632/normal_5fe102006584d.pdfIn PDF document text
    • https://vafuxukosa.weebly.com/uploads/1/3/4/4/134440110/pozovanowelo.pdfIn PDF document text
    • https://fasosizive.weebly.com/uploads/1/3/4/3/134351581/giforarosipilatam.pdfIn PDF document text
    • https://sawilemevopano.weebly.com/uploads/1/3/4/5/134577559/2173471.pdfIn PDF document text
    • https://retizobokeli.weebly.com/uploads/1/3/1/0/131070240/bejiwitexojuv.pdfIn PDF document text
    • https://lesivemiseleji.weebly.com/uploads/1/3/1/3/131381961/nomuzir_pusavupo_bofoduri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490739/normal_5fd5f5833762e.pdfIn PDF document text
    • https://zukamukenipebo.weebly.com/uploads/1/3/1/3/131380388/murubawavuda.pdfIn PDF document text
    • https://jewevugaxezi.weebly.com/uploads/1/3/5/9/135967143/703a8ed4dbd312.pdfIn PDF document text
    • https://labajamipudoxa.weebly.com/uploads/1/3/5/3/135399896/3255351.pdfIn PDF document text
    • https://bukajovogasis.weebly.com/uploads/1/3/4/3/134340533/2149811.pdfIn PDF document text
    • https://kitopelok.weebly.com/uploads/1/3/4/3/134355781/wegawavikakuxexewuw.pdfIn PDF document text
    • https://zakutawevuvukug.weebly.com/uploads/1/3/5/9/135970657/6460711.pdfIn PDF document text
    • https://dokojivoko.weebly.com/uploads/1/3/4/3/134395563/adcb7ef3c1aa5.pdfIn PDF document text
    • https://mepolelo.weebly.com/uploads/1/3/4/6/134626310/robebefopixesapo.pdfIn PDF document text
    • https://fifitusaperofij.weebly.com/uploads/1/3/4/6/134605769/bogapobafak_gexasidanu_dafejuvitup_pejimojomakubeb.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/30adcc39-57e1-438e-91af-c16dccafa7da/fujom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeb90867-67c8-4171-8b95-c2d3fb1f744a/pakistani_movie_azadi_songs_mp3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06727f7f-a1c5-439f-92f9-1050eacc15d8/nexipamelalolixane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23ea134c-ba86-424d-aca6-ed81d7ac3d9f/navogewozeroximaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e16ac06-b456-4490-b7c3-e9b598a59085/piramuweweva.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_off0000e492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE492 5472 bytes
SHA-256: 0d4b99a5c38712d641804b98e1061587b6f91fc318a8de668bd83513b2f416ed
font_01_sfnt_off0000f70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70F 10988 bytes
SHA-256: b788cd766785bff4ee5c7c0e3c98f6d41f9ef4c14c97dab08044ab308a67d103