Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac20e034cd35927…

MALICIOUS

PDF

92.1 KB Created: 2021-04-16 13:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: eebdd73f389698413a3b6bc72231189d SHA-1: b1d1799664328cef6f4c5933a988dc2886b41989 SHA-256: 4ac20e034cd35927407cf506f95fad441b5b849dfec8e020e0b9ca8d434fd746
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://lozipotod.ru/strik?utm_term=crystallizing+public+opinion+by+edward+bernays PDF link annotation
    • https://gakokoxexoboj.weebly.com/uploads/1/3/0/7/130776672/086152f.pdfIn PDF document text
    • https://netukilegulises.weebly.com/uploads/1/3/1/6/131606016/7143511.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390329/normal_5fe3bff53649d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369307/normal_603e920cf0bb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454286/normal_603c1d65516ad.pdfIn PDF document text
    • https://fisomekoxow.weebly.com/uploads/1/3/5/3/135326807/sigorepes_ludal_kowotusutateri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426280/normal_5fc97b07d5dd9.pdfIn PDF document text
    • http://liwurivosopap.medianewsonline.com/business_plan_for_a_fast_food_restaurant.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370303/normal_605cb06787bf3.pdfIn PDF document text
    • https://wexetapita.weebly.com/uploads/1/3/4/3/134307875/kunipufedunu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427103/normal_5ff6bdf87272c.pdfIn PDF document text
    • https://raxunumi.weebly.com/uploads/1/3/4/3/134350385/02065c739a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479718/normal_600745dce9002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474231/normal_5fe92b9732689.pdfIn PDF document text
    • https://rusuligoxajikug.weebly.com/uploads/1/3/4/3/134399392/dutopamol-wumitej-buteritepabogon-xevurofepomuxa.pdfIn PDF document text
    • https://binenivav.weebly.com/uploads/1/3/4/5/134516867/92e809.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/cambridge_english_objective_ielts_advanced.pdfIn PDF document text
    • https://xawawamofolapus.weebly.com/uploads/1/3/1/4/131436997/e6dced.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503578/normal_60570a0e98d93.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://piwakitidi.onlinewebshop.net/unix_basics_commands_with_example.pdfIn PDF document text
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_f0634c681a744106aef9c442f90383f8.pdf?index=trueIn PDF document text
    • http://fubavinexazixo.onlinewebshop.net/calendario_menstrual_2020.pdfIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_75b75421af1640bb8687c9b3b166b5fb.pdf?index=trueIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_31f7e5938e844a9ba759d541e770650c.pdf?index=trueIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_508d9120cf5347079a496cd11c17f16e.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001283c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283C 5528 bytes
SHA-256: b52e7e90af1634aece0357b63f75a27e717cc13b92ebcee1d51916dfc77f3f61
font_01_sfnt_off00013b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2D 11680 bytes
SHA-256: 95205f25eddac5d39438ff7ea261d1d5a8b5f84cc5c7eb9c75a0f169dfc880de