Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e6dd805427194bd…

MALICIOUS

PDF

80.4 KB Created: 2021-05-15 15:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 07f5d0a1edf29f70588bdc966c0e4b76 SHA-1: 835986f9730fd5b3449dd65cc0c66af5a615ffda SHA-256: 6e6dd805427194bd1a19aef7ccd90a94fcf6fe6027cf4f727ea15976c1f60e72
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to drive traffic to malicious sites. The primary URL, vilenefex.ru, is presented with a query parameter related to unlocking a Samsung phone, indicating a phishing or scam lure. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious intent, likely leading to a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://vilenefex.ru/strik?utm_term=unlock+samsung+a10e+metropcs+z3x PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4529281/normal_60401c5cc5bf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374522/normal_606b31e955588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418001/normal_603e0f6cc6a5f.pdfIn PDF document text
    • http://iciko.xyz/kenerosilal1uvhs.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/ghkjaic/tamunezivamiwetivazizu.pdfIn PDF document text
    • http://glasshookahcatering.com/67287868481i2s5u.pdfIn PDF document text
    • http://instapriz.website/best_comments_for_kindergarten_report_cardsda7vh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366655/normal_605703f0be4a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502178/normal_6029b410824d8.pdfIn PDF document text
    • http://morpeoplelife.ru/buxanuweledubatoxivomaduapwli.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/Figjjp3/36439016808.pdfIn PDF document text
    • https://cdn.sqhk.co/zoravuzulop/9iijbhh/best_alarm_clock_app_for_mac.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/nefunupu/ost_digimon_butterfly_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/xivigodubavufepuxitapam.pdfIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_9a4b37b87e704ede950659594c7251f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/98968146085.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/minecraft_pe_island_village_seed_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/jasmine_flower_pics.pdfIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_abe345263f6f4352bb581014ad8d2135.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/56850367818.pdfIn PDF document text
    • https://cf587a47-7c2f-4f55-8bbb-21a4c73503f7.filesusr.com/ugd/8ea597_75fdf520aaaa44bc805b540b1b352bf1.pdf?index=trueIn 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_off0000efb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB6 5784 bytes
SHA-256: dbbcb0ea76f4245939200ecad6971d9e49c1f6e625ac4de40c76f575c3cbca4a
font_01_sfnt_off00010367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10367 2308 bytes
SHA-256: eedc268eedc5e175e56de86a037d9349f25f7d28281473ddbb588b06ac5be49a
font_02_sfnt_off00010d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6D 11364 bytes
SHA-256: 183cc901e5b6be53e556c27e76bafce78a1c0f786813fdc13bf84e48b124b059