Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1cd0abef42f43b2…

MALICIOUS

PDF

76.7 KB Created: 2021-06-13 02:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3e4e86ba6ce5fdaaf49910f11208d430 SHA-1: e4716b7c86c29f54b3d63f175dd9fc270eb55e01 SHA-256: a1cd0abef42f43b2b939b7c08fbc4c11b5e41f5b1848541a0af3413bd4d82cea
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The embedded document body text, though corrupted, appears to reference 'pdfelement 6 free download', indicating a lure for potentially malicious downloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://catamma.ru/pbw?utm_term=pdfelement+6+free+download PDF link annotation
    • https://lefatelaxebaj.weebly.com/uploads/1/3/5/3/135398996/7334711.pdfIn PDF document text
    • https://pukewuvidepuf.weebly.com/uploads/1/3/4/3/134321324/6300357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462678/normal_606d45cb67237.pdfIn PDF document text
    • https://titamifafipife.weebly.com/uploads/1/3/4/3/134315234/5766985.pdfIn PDF document text
    • https://risonozolediwar.weebly.com/uploads/1/3/1/3/131398017/9303928.pdfIn PDF document text
    • https://gideturifit.weebly.com/uploads/1/3/4/8/134887905/4996606.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490746/normal_5fcecf3ed9faf.pdfIn PDF document text
    • https://mijuzitomos.weebly.com/uploads/1/3/4/6/134662295/fisijafojikepoxozi.pdfIn PDF document text
    • https://vogowabiruzo.weebly.com/uploads/1/3/2/6/132681596/biloreluwega.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451555/normal_5fcef917443d8.pdfIn PDF document text
    • https://guladusive.weebly.com/uploads/1/3/0/9/130969442/mibedinorafavo.pdfIn PDF document text
    • https://limifotediko.weebly.com/uploads/1/3/5/3/135325738/farejaw_pavufavunuguro_modirapomaju.pdfIn PDF document text
    • https://fejomuzuzozasas.weebly.com/uploads/1/3/4/7/134748710/7474796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450259/normal_6040b602d3260.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://jajisaparev.pbworks.com/w/file/fetch/144411312/difojomuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6b1abb1-3d3b-4777-abd2-b7dcd98597cd/bsba_major_in_operations_and_supply_chain_management.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adbb3340-79d0-4d4f-8d24-1be48f090918/fuxivamewesi.pdfIn PDF document text
    • http://dutamaboxiwa.pbworks.com/w/file/fetch/144803280/john_c_maxwell_leadership_101_indonesia.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/w/file/fetch/144543921/4649943649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e2d0732-7940-4494-8268-31466be23212/how_to_wind_a_tempus_fugit_clock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31ccb14c-f5c3-406a-a183-a36cfdf18ead/vawuxumakorozubet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e60a670-c122-4564-a9a6-3bf8544b943a/los_5_lenguajes_del_amor_de_los_jovenes_gary_chapman.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32F 4860 bytes
SHA-256: d4e62f2db7dc6058d09121033cc68750878d2fd41761157601fb7e01d05d3afe
font_01_sfnt_off0000f3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A3 10580 bytes
SHA-256: 2ec334a786f2e0e0a2e35163b317368d18ebf2ae0b79e898b73968c6797982e6
font_02_sfnt_off00011795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11795 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3