Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc1c34415a82944…

MALICIOUS

PDF

66.7 KB Created: 2020-12-05 14:00:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9048d72d86d0fdddc96a8cd9cdc54ed SHA-1: 1c7ce8535912a78001445c8c196fe97ff0b98dbe SHA-256: 5dc1c34415a82944e4cfd3e6c07954c9be8e826ef81831d6041808958fe82200
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'competency assessment template', likely intended to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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 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/aws?utm_term=competency+assessment+template
    • https://cdn-cms.f-static.net/uploads/4393019/normal_5fa1c323d91e4.pdf
    • https://vajizekof.weebly.com/uploads/1/3/4/5/134594154/fumex_zijorexifekajo_nilibubugowinob.pdf
    • https://vunuvuvoxi.weebly.com/uploads/1/3/4/8/134889930/1835895.pdf
    • https://telexetobowu.weebly.com/uploads/1/3/4/3/134339901/vesuropuxinikaluzik.pdf
    • https://mazoguwikite.weebly.com/uploads/1/3/4/6/134614920/suboxok-badutibije.pdf
    • https://cdn-cms.f-static.net/uploads/4464851/normal_5fa24de470963.pdf
    • https://fikupekuxugo.weebly.com/uploads/1/3/4/6/134612485/wowafapo-jimudapi-rubuvizap-netokalo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc389629955c744b54c2322/t/5fc489671972c46e3c2ea100/1606715751299/paintball_gatlin_guns.pdf
    • https://static1.squarespace.com/static/5fc0052111f6a4198480c96b/t/5fc201364f98375720263dd4/1606549814953/lax_to_fiji_flight_time.pdf
    • https://s3.amazonaws.com/paxuvagal/jumping_the_broom_meaning_yahoo_answers.pdf
    • https://s3.amazonaws.com/xamibudasagas/fezamobapo.pdf
    • https://s3.amazonaws.com/juduk/35149786949.pdf
    • https://uploads.strikinglycdn.com/files/b8d766bf-1003-49b4-b5f3-dc0b9e72fbb4/88986263235.pdf
    • https://s3.amazonaws.com/sugaguxagu/pathophysiology_of_cerebral_malaria.pdf
    • https://s3.amazonaws.com/bajapovogam/wogekuzajogigutezabuto.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c994.bin
04b32ccb1d866959e97b9295bf3f133973b841af65f2d2a0853ce27fcc8dedbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC994 4992 bytes
font_01_sfnt_off0000da82.bin
3ac15e30410f31e0bb62fab2d0521aeed3dc542783b5e121857d5059322d0103		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA82 10332 bytes

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