Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4c23357273baea…

MALICIOUS

PDF

68.6 KB Created: 2021-03-12 16:42:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e3175063b7139ab743cecc583bf938ba SHA-1: 4bfc49a961e2472da88cf99c213fed992adfabfc SHA-256: 7a4c23357273baea1bc6193346f17dfe7979f0ad80ec4ba5d1de12a8ec8c3dce
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. The embedded URLs suggest a potential phishing or malware distribution scheme.

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://leonvi.ru/award?keyword=africa+toto+easy+piano+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419437/normal_5fce763076cbb.pdfIn PDF document text
    • https://samabuwe.weebly.com/uploads/1/3/0/7/130739499/xolenirinalusop-wuxejiget.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472204/normal_6028ece88858f.pdfIn PDF document text
    • https://cdn.sqhk.co/wabajevebe/eao6iaa/pokemon_sword_battle_simulator.pdfIn PDF document text
    • https://cdn.sqhk.co/rawatajizefu/fJ4wica/plants_vs_zombies_games_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/pugalaleluti/jghhiaa/kigonekutebetofisikepo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369174/normal_5ff1691ccf7d9.pdfIn PDF document text
    • https://gigatadozewat.weebly.com/uploads/1/3/1/6/131606492/5628119.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459640/normal_6008cb9c049ee.pdfIn PDF document text
    • https://wufavupo.weebly.com/uploads/1/3/4/3/134319323/zuwat.pdfIn PDF document text
    • http://kidufamipowanot.mywebcommunity.org/beats_by_dre_studio_2_wireless_outside_exterior_panel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465012/normal_6022595cb952a.pdfIn PDF document text
    • http://wejuveziwep.mypressonline.com/62783344468.pdfIn PDF document text
    • https://cdn.sqhk.co/xadeviro/gjmhdhb/movies_free_download_app_for_pc.pdfIn PDF document text
    • https://lawukexudemodu.weebly.com/uploads/1/3/4/0/134041757/1160875.pdfIn PDF document text
    • https://cdn.sqhk.co/tipusuzog/hgKgiji/62640812055.pdfIn PDF document text
    • https://cdn.sqhk.co/vakinebavun/Rzajfja/adding_and_subtracting_fractions_practice_sheet.pdfIn PDF document text
    • https://tajujarosoko.weebly.com/uploads/1/3/4/7/134749081/85f1fb28db3a.pdfIn PDF document text
    • https://cdn.sqhk.co/bikuloxisage/5hdACzz/android_tablets_for_sale_south_africa.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/etiologi_bronkitis.pdfIn PDF document text
    • http://dofujifeluradep.medianewsonline.com/xutipejup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b5c971e-0875-4d0b-9491-7ae0c6b52bf7/spanish_to_english_dictionary_book_online.pdfIn PDF document text
    • http://dexivovadoxexo.myartsonline.com/35728161674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/042e7196-b4ea-49bd-9dae-536e67695006/fufegepamotibejeso.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_off0000cf58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF58 5208 bytes
SHA-256: 6747b6b745a50056f63731eddf491f813d0851e0798701d75f299a1b8c681a3c
font_01_sfnt_off0000e12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12B 10388 bytes
SHA-256: 5eaac634d57dca70cb7004d761988b5fb5150d3463f9382379c874484bc1e342