Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3f56fca58dbccd…

MALICIOUS

PDF

86.4 KB Created: 2021-05-15 16:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0239552c2a9c2d0c68170418d5fd3717 SHA-1: e9929fa3bb74327e664db225a0125e8bb5cca6f6 SHA-256: 5c3f56fca58dbccd33afb11aa0663d4acc6dde7f0536bc75ed1c679c19dd5e40
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, with the primary heuristic indicating a 'PDF_SEO_LINK_FARM' which suggests a malicious intent to redirect users. The document body is heavily obfuscated and unreadable, but the presence of numerous external URLs points towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://botokaw.ru/strik?utm_term=vox+ac30c2+specs PDF link annotation
    • https://loxoxonejuk.weebly.com/uploads/1/3/4/6/134684666/botizufonez_timegajikafi_sifuzavazalun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450511/normal_5fe10625c5e0f.pdfIn PDF document text
    • https://xizuzumuk.weebly.com/uploads/1/3/2/6/132682261/a06fc207b9c4.pdfIn PDF document text
    • https://rudofodirofebas.weebly.com/uploads/1/3/0/7/130739781/3355537.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460076/normal_6009f11185696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477626/normal_605913dba80d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368467/normal_5ff5a2ed6e745.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414498/normal_5fe2e2cf2136f.pdfIn PDF document text
    • https://jekufagiz.weebly.com/uploads/1/3/0/7/130739150/bubunalonamumelerewo.pdfIn PDF document text
    • https://notilapixoto.weebly.com/uploads/1/3/4/3/134397855/0f4e626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369498/normal_6053db2250dd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_606097e81faae.pdfIn PDF document text
    • https://begafirezudafo.weebly.com/uploads/1/3/1/4/131438667/173281.pdfIn PDF document text
    • https://jibajupo.weebly.com/uploads/1/3/1/6/131636806/8334825.pdfIn PDF document text
    • https://riwusivi.weebly.com/uploads/1/3/4/9/134900433/3915433.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
    • https://s3.amazonaws.com/lewuli/ponobagomujadikidebe.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/vector_canoe_free.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/android_x86_sourceforge.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/honda_maintenance_code_b_127.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/baldum_aov_guide.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_off00010721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10721 4824 bytes
SHA-256: 06e0ebb3d5fa21bcb47489117dbe93bbc211c7cc1e8eb26466867e1c12922947
font_01_sfnt_off00011781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11781 11320 bytes
SHA-256: e3d33553587ad41516cce94864ba5ecb94af43fed05c871eda9ec78a7bb9ca28
font_02_sfnt_off00013df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF3 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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