Malicious PDF — malware analysis report

Static analysis result for SHA-256 88dcbc9bd40defac…

MALICIOUS

PDF

77.2 KB Created: 2021-04-03 04:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5071ae06b651093bf576d836ff6da36e SHA-1: 94418f39a76ea421d3e1f157f2f4afb55b0f4a53 SHA-256: 88dcbc9bd40defac19f2e6a40f4388643dddd73188ff88c239cc760366a1c6ee
206 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a phishing or scam campaign, indicated by the 'SE_CALLBACK_LURE' heuristic and the presence of numerous external links, many hosted on disposable domains. The document body, though partially corrupted, contains text suggesting a cancellation or form-related lure, aligning with common phishing tactics. The ClamAV detection and ML classifier further support its malicious nature, likely involving exploitation to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://seumenha.ru/123?utm_term=cancel+la+fitness+form+pdf PDF link annotation
    • https://wavoxodasamemat.weebly.com/uploads/1/3/5/3/135348105/tarositizano-pobonot-bikonavo.pdfIn PDF document text
    • http://supfitket.buzz/block_breaker_deluxe_2w7pkj.pdfIn PDF document text
    • https://xitonodulamet.weebly.com/uploads/1/3/4/3/134307836/pitigiwixivokad_gokunotodokuke_valojenel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415543/normal_6001031a55bbe.pdfIn PDF document text
    • http://mopowataxix.medianewsonline.com/wave_motion_book.pdfIn PDF document text
    • https://xopozutafedas.weebly.com/uploads/1/3/1/4/131453480/dilowukoj.pdfIn PDF document text
    • https://jeduwenerapowi.weebly.com/uploads/1/3/4/6/134678879/rezukirare.pdfIn PDF document text
    • https://rawowoxok.weebly.com/uploads/1/3/4/3/134309987/54ffc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465007/normal_5fe9d9cb16e9c.pdfIn PDF document text
    • http://dojemop.mywebcommunity.org/construye_seguro_aceros_arequipa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468553/normal_5fd2283411617.pdfIn PDF document text
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/pikavinixo-nabaw.pdfIn PDF document text
    • https://jizimixu.weebly.com/uploads/1/3/4/0/134095846/665603.pdfIn PDF document text
    • http://kasyanbeauty.com/44731556938cf0wh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000edea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 5208 bytes
SHA-256: e358e5a9021aa739fab2a779a8ce99c5f987ccb7702e6d1f93859501a37ff711
font_01_sfnt_off0000ff88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF88 11300 bytes
SHA-256: e704301c601e88ec97edf1521b04c0fdf7a7abe6a6ff063ee13ea37e71c298d9

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