Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec838f4faf7bcec…

MALICIOUS

PDF

82.7 KB Created: 2021-03-21 01:24:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 621dc815bf2dc41d709bbecbe66f94b5 SHA-1: 996b084a85f0b3b22242874d78dd655029437ef3 SHA-256: aec838f4faf7bcec39bcc3bafd1ded91832ef99bba471962179ecd383886d191
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('ponafet.ru') and another to a link farm ('serdyukov.pro'). The presence of a 'download button' heuristic further suggests a lure to download a payload or navigate to a malicious site.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=how+to+start+a+speed+queen+commercial+washer+for+free
    • http://serdyukov.pro/33516351251j84g4.pdf
    • https://cdn-cms.f-static.net/uploads/4424666/normal_6033555febaa5.pdf
    • https://rogebanapixiwo.weebly.com/uploads/1/3/5/3/135343373/1857620.pdf
    • http://megatorg.ru/does_alec_die_in_city_of_heavenly_fire4mzyc.pdf
    • http://www-sfr-fr-monespace.com/les_noces_de_figaro_beaumarchaisaphhn.pdf
    • https://cdn.sqhk.co/zirixegip/P7XidPL/bodisazi.pdf
    • https://static.s123-cdn-static.com/uploads/4493541/normal_5fcc9972303aa.pdf
    • https://cdn.sqhk.co/dixejetafap/VhaYjhb/podcast_app_free_podcast_player_y.pdf
    • http://telgrm.site/222176993539psh3.pdf
    • http://leftoutclub.com/30465941884j5a1z.pdf
    • https://static.s123-cdn-static.com/uploads/4459174/normal_5fed09a05ed6b.pdf
    • https://cdn-cms.f-static.net/uploads/4372673/normal_60520fe9a5fb6.pdf
    • http://jilet1.club/self_closing_flammable_cabinet_requirements_californianie1i.pdf
    • https://nedugapepo.weebly.com/uploads/1/3/4/2/134265444/952666.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/54065dc5-b146-46da-9802-e8ea42637be2/24139638396.pdf
    • https://uploads.strikinglycdn.com/files/f7360517-420e-4596-91de-2588aa67eff5/lol_patch_10.16_release_date.pdf
    • https://uploads.strikinglycdn.com/files/4e9eae88-000a-4f01-9b47-1f318ac2de92/bisalirobizimifugebo.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_off00010295.bin
af58010018a0052fa6dfb2a22657052a8bc8d07583d31f4f61ae43729490db51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10295 5576 bytes
font_01_sfnt_off0001156b.bin
7a2898c03a52b9c4a434c18f2936036879124cf8d06d9ac5eb4c7938f0e10d44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1156B 11764 bytes

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