Malicious PDF — malware analysis report

Static analysis result for SHA-256 5abf0f30d9073174…

MALICIOUS

PDF

71.9 KB Created: 2021-04-04 14:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: febeaf5f5b96f24bd0962da4963374c4 SHA-1: 1045882477c14d8429ea1a9a5969109090300518 SHA-256: 5abf0f30d9073174774b7af18db48116d84b97190bb39bba2df7820a81fb0e9b
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one specifically crafted to appear as a free download for a novel, likely a lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the embedded URLs suggest a mechanism for delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=call+me+by+your+name+novel+pdf+free+download
    • http://ruzodoveme.iblogger.org/53942379172.pdf
    • http://fawikenaxalu.scienceontheweb.net/7462877767.pdf
    • http://pasadurasasagi.medianewsonline.com/23455152267.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_f480784676d94365ad5f3bc321da594e.pdf?index=true
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_3ac4989eebe140e08a6aed049771d1e9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4dbfb9d9-4228-4297-8133-5d8fc270f812/98932198352.pdf
    • http://jivupezujoked.rf.gd/32228224868.pdf
    • https://uploads.strikinglycdn.com/files/c000a4bd-2396-465f-bdf3-7f952c994215/z_score_chart_calculator.pdf
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_d3226282b5bd4c929799165523e0f011.pdf?index=true
    • http://xunawikavamenu.epizy.com/71961016827.pdf
    • http://kunuwinafedib.epizy.com/acetylcholine_neurotransmitter.pdf
    • https://s3.amazonaws.com/mokixetat/sony_sa-ct260h_wont_turn_on.pdf
    • http://rubuvajaroxe.epizy.com/template_ppt_tumblr_free.pdf
    • https://s3.amazonaws.com/gupojakami/what_does_contention_mean_in_information_technology.pdf
    • http://pijutisiguzog.rf.gd/69719905867.pdf
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_cbc8393af7f144f88c7b35e044aeaa40.pdf?index=true
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_767e06a4bb234a9daf6738f797281186.pdf?index=true
    • http://jiwigazuvix.rf.gd/67145174003.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8d6.bin
0e88e7a8c80d10ecd81a6f381930d997bd773a2febe3a9c4c20a570d8bde0e8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D6 5308 bytes
font_01_sfnt_off0000eae2.bin
189d5743fec7c8c703fb4c9be73c77ee78abca40c88f2d7001f021be458eeb74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE2 10960 bytes

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