Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51179697f8fd73a…

MALICIOUS

PDF

84.6 KB Created: 2021-02-28 15:32:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a0fdbe91be906a75900167719307d2ea SHA-1: 3e8ecebe68237a9d03961cf7f818188885fb8b11 SHA-256: f51179697f8fd73a4171a2d168312244bcfb270ea961c9fec3aaab5a89df9f64
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the overall structure are indicative of a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=when+to+enter+a+divergence+trade PDF link annotation
    • http://yblda.fun/toferapooeby8.pdfIn PDF document text
    • https://lusimijibujadex.weebly.com/uploads/1/3/4/6/134677052/rodek.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/the_immortal_life_of_henrietta_lacks_chapter_2_questions_and_answers.pdfIn PDF document text
    • https://jarofuzaduse.weebly.com/uploads/1/3/4/5/134502270/afd588eb.pdfIn PDF document text
    • http://rakodunugi.iblogger.org/sound_recorder_apk_for_android.pdfIn PDF document text
    • http://podeves.xyz/62120462390e3ct3.pdfIn PDF document text
    • http://bibopasaxuvibu.mypressonline.com/xogejebazur.pdfIn PDF document text
    • https://zeruposizagaki.weebly.com/uploads/1/3/4/8/134854722/9636122.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387922/normal_5fcb969776e5e.pdfIn PDF document text
    • http://lakulikelanu.iblogger.org/pajot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479675/normal_6039afc3b248f.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/xukasisugebejo.pdfIn PDF document text
    • http://shoop-fg.ru/tugolokakujuo9snp.pdfIn PDF document text
    • http://ravitidi.22web.org/arrma_granite_4x4_blx_manual.pdfIn PDF document text
    • http://bigakeka.iblogger.org/59187096901.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473062/normal_600a65d553921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372371/normal_603533f1d6330.pdfIn PDF document text
    • http://barbanapoli.moscow/is_the_shark_apex_a_good_vacuum9x3mw.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
    • http://tadufojisewito.epizy.com/78088120708.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 4852 bytes
SHA-256: 3f753b1f3725d317c5d0c1c0c222306d2df7d330ce5d1a7ad8824d67c4975614
font_01_sfnt_off00010429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10429 1940 bytes
SHA-256: 3f23ae85e37b15402f879ea150537e7cb0ed239a072db7b6928757f1c19d6afc
font_02_sfnt_off00010d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D73 11744 bytes
SHA-256: c492c5df68df3877ff3f112adb53c092300ecbb54fec1a4c4d28ef79afc51814
font_03_sfnt_off00013496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13496 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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