Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd30f09bfa0b0c25…

MALICIOUS

PDF

69.3 KB Created: 2021-01-28 03:50:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8035612deef08f61ad424161aaa7f052 SHA-1: efb512c12d60e0c88dce9566c5da04c87a30ad7a SHA-256: bd30f09bfa0b0c25d1124f1f07968cad55a37768dd6dd006dcc53cee81f20ea6
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one critical heuristic identifying it as a malicious redirector link. Another critical heuristic flags it as a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or malware distribution document.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=how+to+test+bt134+triac In PDF document text
    • http://sacredname.ru/flying_car_transport_simulator_mod_apk_hackezbt9.pdfIn PDF document text
    • http://vnds-v.website/flappy_dunk_score_hackkfxww.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_5fd662602b81c.pdfIn PDF document text
    • https://susudomi.weebly.com/uploads/1/3/5/3/135319884/sogubupupov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473638/normal_5febb20e9fa4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486060/normal_5fd2f4c26c7f0.pdfIn PDF document text
    • https://zivixitusinuz.weebly.com/uploads/1/3/1/3/131380786/f45ecdc8.pdfIn PDF document text
    • https://tevupiju.weebly.com/uploads/1/3/4/8/134865653/vezuzuli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379222/normal_5fc7c5fe5e781.pdfIn PDF document text
    • http://ighelperscenter.com/nugizozurutikapir0v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/medianswer_mask_review.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/fupipabujoli.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/windows_loader_2._2._2_softonic.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/gojato.pdfIn PDF document text
    • http://jiporiri.rf.gd/87533361031.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/android_tv_flash_player_browser.pdfIn PDF document text
    • http://roweviwumi.epizy.com/diagnostico_ambiental_local.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D6 5256 bytes
SHA-256: f83ca2a180a58c4b256b673d1e783d429fde932523eee705d9d20b3ac1bcdf75
font_01_sfnt_off0000dbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE0 13852 bytes
SHA-256: c36a135f0249ecf7e476c7b38bc70837c266e7bd6bff36a405b49575cfd9a035

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