Malicious PDF — malware analysis report

Static analysis result for SHA-256 2251a50d3eeeaaf9…

MALICIOUS

PDF

83.5 KB Created: 2020-12-31 15:00:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1f6fb43e23e46c371146d3d8b53eb9a8 SHA-1: b64400bfe883fb06b4c8e4219b976e35ed00055e SHA-256: 2251a50d3eeeaaf9c279f51fd9c87d5dab701c47fb89b6f44fd22b5c379f02b2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to potentially unwanted software downloads, such as 'psiphon apk download free'. The PDF structure and embedded content indicate a deliberate attempt to obfuscate its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=psiphon+apk+download+free PDF link annotation
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/74e88eb3ff4c.pdfIn PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/pulod.pdfIn PDF document text
    • https://duketexu.weebly.com/uploads/1/3/4/7/134725944/wakazik_jazixewo_xoxavulekat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5f893ee85ff93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368949/normal_5f907907aa243.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/fivubetefo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485822/normal_5fd79a5811c23.pdfIn PDF document text
    • https://dudakodut.weebly.com/uploads/1/3/4/4/134497067/disoduvemidemexipet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451753/normal_5fce2efebb7ff.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/1486141.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411717/normal_5fcbec4eed126.pdfIn PDF document text
    • https://nezejigon.weebly.com/uploads/1/3/4/6/134611081/jopubevidul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455406/normal_5fed5a4591469.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/edc8d669-8d2d-44e1-973b-5986341d230e/geginuxuferovafidefob.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000111a8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x111A8 26892 bytes
SHA-256: 6e06ed86a26e6c268f75908c64a44e82a7a465f353b202ec8d142d6edc5b43e0
font_00_sfnt_off0000da22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA22 5288 bytes
SHA-256: 624ca984293f95f563567be82e2e2a30b2e7d4579a1d2bcaf30390c70c2cdf85
font_01_sfnt_off0000ec25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC25 10888 bytes
SHA-256: 256b309b78ea5a731e10392140b2e242c2093770f67bbaf2faa9dbceb81e375d

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