Malicious PDF — malware analysis report

Static analysis result for SHA-256 770fb428915e3fa2…

MALICIOUS

PDF

80.1 KB Created: 2021-05-03 14:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0faeedcc6d14c0786df4f0aa8fe177d1 SHA-1: 1208d835b187d6edc40959b5beb0a5116a9f6831 SHA-256: 770fb428915e3fa290ccf2779566030ff49405c3ae5c52f8ff94a5374e6e8307
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 0.9998

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=how+to+install+ring+security+light+and+camera PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413848/normal_601645b98cd53.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/6647269.pdfIn PDF document text
    • https://gisodotok.weebly.com/uploads/1/3/5/9/135971357/8c1ef911.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385204/normal_60201c6d08256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392451/normal_6059ec3ed33a2.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/yFheyqp/kanto_pokemon_tier_list.pdfIn PDF document text
    • https://dosodufixelo.weebly.com/uploads/1/3/2/6/132682620/d5f1be9cb3079.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/eTGlyFv/sisitujososofiguma.pdfIn PDF document text
    • http://fesalasan.mygamesonline.org/brunner__suddarths_textbook_of_medical-surgical_nursing_14th_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372707/normal_6045f568d642e.pdfIn PDF document text
    • http://lulodexav.iblogger.org/pathophysiology_of_puerperal_sepsis.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/werewolf_totems_white_wolf.pdfIn PDF document text
    • https://nawajutexi.weebly.com/uploads/1/3/4/1/134108687/josajir.pdfIn PDF document text
    • https://limorevoxa.weebly.com/uploads/1/3/4/6/134611026/daminexusuxabel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1160a196-6e18-49bd-931c-438029629b47.filesusr.com/ugd/40338c_61c0b8ef4610473592f054669546e5ba.pdf?index=trueIn PDF document text
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_8e0b89767a0842159d6b01e5b867ab2e.pdf?index=trueIn PDF document text
    • http://ripaleje.rf.gd/79959441715.pdfIn PDF document text
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_677e15097ab5455da27c3983340ba537.pdf?index=trueIn PDF document text
    • http://soromivimurug.epizy.com/leworaregiwevikus.pdfIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_dda8cccd28c1419b91415a3126a1bebd.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_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 5508 bytes
SHA-256: f4bdc5116ed7cf12a883954dccbb59161b044077a21f744615a3508aa297f7db
font_01_sfnt_off00010b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8D 10908 bytes
SHA-256: 0f93c38ad8119776fcf5b95027c85054122ebfa240b480d3dd0e49691ed0e7ea