Malicious PDF — malware analysis report

Static analysis result for SHA-256 3635155a22221020…

MALICIOUS

PDF

81.5 KB Created: 2021-02-24 22:07:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b6264073cdaef676ba060407f3d291c6 SHA-1: 19f09a284824b7f289ba13869af631423b37a28e SHA-256: 3635155a222210207e88f9eb41a61bde5c353c2ffaa9ec210edef5e2bddb6e84
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate this PDF is a malicious redirector and part of a link farm, likely designed to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the embedded URLs and link farm structure are indicative of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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/strik?utm_term=how+to+setup+atmos+clock In PDF document text
    • https://static.s123-cdn-static.com/uploads/4447108/normal_60012d3995f99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490125/normal_5fc56e4c849a2.pdfIn PDF document text
    • https://sinuvuliwazima.weebly.com/uploads/1/3/1/8/131871572/3245195.pdfIn PDF document text
    • https://xoludifatak.weebly.com/uploads/1/3/4/4/134477652/witelal_vodem.pdfIn PDF document text
    • https://kunugamonigosa.weebly.com/uploads/1/3/1/8/131871761/f8bc25a82bdf307.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413966/normal_60089a2be476b.pdfIn PDF document text
    • https://japipimimobuxi.weebly.com/uploads/1/3/1/0/131071183/xewirajivitalor-buvasefubujemuw-nigememogaxe.pdfIn PDF document text
    • http://somaliguseji.iblogger.org/62434345104.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365642/normal_5fec367d4de15.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/vavejijitatofu/mikozisikukegipalotipabab.pdfIn PDF document text
    • http://demuremapinob.epizy.com/carwale_game_carwale_game.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/sewiror.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/sozalowotadufato.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/volek.pdfIn PDF document text
    • http://bigerubuseke.rf.gd/abyna_morgan_magic_spot.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/ledomip.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/candy_crush_hack_ios_apk.pdfIn PDF document text
    • http://tivesotevobewuz.epizy.com/income_tax_calculation_sheet_2019-_20.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_off00010361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10361 5100 bytes
SHA-256: 3a05c0a3912563a826cd1a6c1eaea7f5626439805a7506dd7c017fe90a731d35
font_01_sfnt_off000114be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BE 10596 bytes
SHA-256: 62bd3507bee148e5ef7fd76e420ed072536b8a3209a931d78b98403e8b586cb4

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