Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab8bf683ae04d5c…

MALICIOUS

PDF

73.6 KB Created: 2021-01-17 21:30:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a2a5d5477ac13935bd1989f89f4c9da9 SHA-1: 14e6f3e4891004e06da500113f053ccc2e3df5bc SHA-256: aab8bf683ae04d5c4beeb34b3389f6618fb21ae2ee1d481889fde09b89330115
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded links, many pointing to disposable hosting domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://trafffi.ru/123?utm_term=robin+hood+and+the+three+squires+ballad+summary PDF link annotation
    • https://site-1174866.mozfiles.com/files/1174866/13765595730.pdfIn PDF document text
    • http://viwimewi.22web.org/bichhoo_video_song_tinyjuke.pdfIn PDF document text
    • http://befemuvejizu.22web.org/75132870943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409801/normal_5fabc1ab5e5e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486994/normal_5fc8c7f7f024e.pdfIn PDF document text
    • http://kivudutamazawan.22web.org/96583389859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391327/normal_5fa825a50a7b9.pdfIn PDF document text
    • http://vinuporabomod.iblogger.org/assassin_s_creed_brotherhood_hd_wallpaper.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426087/normal_5fc6467f8c4a6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lulanojejol.epizy.com/11786330802.pdfIn PDF document text
    • http://toramowajo.epizy.com/pikofomejo.pdfIn PDF document text
    • http://jojisoxig.epizy.com/kolkata_guide_map.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/des_moines_register_sports_reporters.pdfIn PDF document text
    • http://xevikosurozogin.rf.gd/iti_aliganj_lucknow_admission_form_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_off0000e09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09F 5440 bytes
SHA-256: 442774347f80d0b4577c2ab973c6b831005ba3b48a1e0db60bc4ec9654328967
font_01_sfnt_off0000f2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F3 11748 bytes
SHA-256: 2e90d8ae00924b7b6f49110e8abea64b6a955bdc02973c2fe3f3450b6e215fe8

Open this report in the interactive analyzer, or submit your own file for analysis.