Malicious PDF — malware analysis report

Static analysis result for SHA-256 577cf30c8c351b0f…

MALICIOUS

PDF

90.2 KB Created: 2021-03-29 00:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a3c4815120686a35dec27dc468e75c4 SHA-1: ad2bb042f216f1e9d199c37c9b4fff7b29997c01 SHA-256: 577cf30c8c351b0f40e4ba0fe8926b80562d833c5243f9766e3b745a7018c309
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the document's primary purpose is to redirect users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/strik?utm_term=aa+10th+step+checklist
    • https://cdn-cms.f-static.net/uploads/4406466/normal_605a75be0ff55.pdf
    • https://static.s123-cdn-static.com/uploads/4415055/normal_5ffe64b2a0ebd.pdf
    • https://vaxofawaz.weebly.com/uploads/1/3/2/6/132682661/1127555.pdf
    • https://cdn-cms.f-static.net/uploads/4474448/normal_5fe705a0cfd91.pdf
    • https://fafixujanubaza.weebly.com/uploads/1/3/4/0/134096145/rivexinomoxe.pdf
    • https://semetipakes.weebly.com/uploads/1/3/0/7/130775831/5305038.pdf
    • http://vawojiw.22web.org/57103682533.pdf
    • https://cdn-cms.f-static.net/uploads/4460983/normal_5fe8291e44bc9.pdf
    • https://cdn-cms.f-static.net/uploads/4452850/normal_5fd77b60abb30.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wutezigojuxi/how_to_change_the_primer_bulb_on_a_ryobi_weed_eater.pdf
    • https://s3.amazonaws.com/wejuvono/codashop_ff_apk.pdf
    • https://s3.amazonaws.com/zagubip/full_extended_sheets.pdf
    • https://s3.amazonaws.com/vavejijitatofu/franny_and_zooey_book_cover.pdf
    • https://s3.amazonaws.com/zuwosil/92255806889.pdf
    • http://mesuwirafifi.rf.gd/nugelawamazeliperokanoj.pdf
    • https://s3.amazonaws.com/wixamupelinere/84822249256.pdf
    • https://s3.amazonaws.com/fadedosi/jabajiz.pdf
    • https://s3.amazonaws.com/vedexajawo/42607189257.pdf
    • https://s3.amazonaws.com/bojafazes/lapd_police_report_tracking_number.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c1f.bin
dc3cd50cb21b5b872bbc894890b9caa56ba5edf793ac93bb1ec7234f01a48478		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1F 5172 bytes
font_01_sfnt_off00011dbb.bin
996b8959a5b38a76f9832e312e2a9d83dfdddf4b3b53ca8a945ebb3ea5823081		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBB 11540 bytes
font_02_sfnt_off000144e1.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144E1 16092 bytes

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