Malicious PDF — malware analysis report

Static analysis result for SHA-256 4491d1a2ef8d2811…

MALICIOUS

PDF

81.4 KB Created: 2021-01-17 14:58:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6e9151fc5b2345f56a10708a6ec617b9 SHA-1: 761013924acdc8184c2ca997d508f56ce06f7802 SHA-256: 4491d1a2ef8d2811257a841fca4521eeed5c2a84f2d0a0122158749cd526edfa
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains a large number of external URIs, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The presence of numerous external links points towards a tactic of distributing or obscuring malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/123?utm_term=tan+long+haired+dachshund PDF link annotation
    • https://site-1178025.mozfiles.com/files/1178025/mizosasiperofajiza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365627/normal_5f9a874e20aaf.pdfIn PDF document text
    • https://komimuvupelogi.weebly.com/uploads/1/3/4/3/134312664/dubufeka.pdfIn PDF document text
    • https://cdn.sqhk.co/tumupowe/gqa6mii/are_hobby_lobby_stores_open_in_mn.pdfIn PDF document text
    • https://voziguwotameba.weebly.com/uploads/1/3/4/3/134345279/visokumevu.pdfIn PDF document text
    • https://site-1172512.mozfiles.com/files/1172512/sodumev.pdfIn PDF document text
    • https://bafumujem.weebly.com/uploads/1/3/4/4/134498711/tofadugetexa.pdfIn PDF document text
    • https://site-1168315.mozfiles.com/files/1168315/band_baaja_baaraat_movie_song.pdfIn PDF document text
    • https://gawufuxawejax.weebly.com/uploads/1/3/1/8/131855981/1facb3b.pdfIn PDF document text
    • https://site-1171658.mozfiles.com/files/1171658/stick_cricket_live_tips_and_tricks.pdfIn PDF document text
    • https://site-1177655.mozfiles.com/files/1177655/bandhan_janam_janam_ka_serial_video.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/b8df2702d53160b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481065/normal_5febc4a3f16ae.pdfIn PDF document text
    • https://fadefewili.weebly.com/uploads/1/3/4/3/134316521/b83ce96b.pdfIn PDF document text
    • https://site-1167950.mozfiles.com/files/1167950/canon_eos_60d_owners_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386361/normal_5f9606f4980f9.pdfIn PDF document text
    • https://cdn.sqhk.co/supuzeren/YgZlgdR/fitbit_inspire_2_bands_leather.pdfIn PDF document text
    • https://site-1168325.mozfiles.com/files/1168325/weed_farmer_overgrown_apk_license.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/fhjhLYA/brick_builder_lego_star_wars_republic_gunship.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420608/normal_5f98da863b91c.pdfIn PDF document text
    • https://site-1172047.mozfiles.com/files/1172047/blast_it_2_space_shooter_games.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B2 4952 bytes
SHA-256: 3f9cf3ab8ffb9dea9eec10aa8dbfcc80ae75a8bbea33ab99a6fde5e8e959c59c
font_01_sfnt_off0001036f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036F 10980 bytes
SHA-256: 6adb2d88c7cd28bdeb973fe480f7382e6650d9c9347e7dbc6d5e8f921bfe4910
font_02_sfnt_off000128d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D9 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176