Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57decb9a5c3c022…

MALICIOUS

PDF

67.4 KB Created: 2021-05-15 13:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cf5644e47f0cf98ab9d8b0fcd27f068e SHA-1: 921ec0dba60344f00dc0f5e1024ca6e4801f497d SHA-256: a57decb9a5c3c0224bd611c5d6926506cf91c51d3710054693b9982af06830b1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spamming operation. One of the primary external links is to zajinet.ru, which is likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=2008+ford+f350+work+truck PDF link annotation
    • https://cdn.sqhk.co/tadanopi/Piijcie/77356995563.pdfIn PDF document text
    • https://tatagufok.weebly.com/uploads/1/3/4/6/134692967/4799052.pdfIn PDF document text
    • https://cdn.sqhk.co/gegenosuzun/ic8ohaw/81179181417.pdfIn PDF document text
    • https://zetitazafoxiz.weebly.com/uploads/1/3/4/0/134040412/5938922.pdfIn PDF document text
    • https://cdn.sqhk.co/mejabutumu/bGhhoii/escape_from_alcatraz_swim_2019_results.pdfIn PDF document text
    • https://pojosividadom.weebly.com/uploads/1/3/4/5/134524524/4569101.pdfIn PDF document text
    • https://jatitebomotopoz.weebly.com/uploads/1/3/0/7/130776336/juxedomapi.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/fidCiaN/i_know_that_song.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/0APdMhg/slice_of_italy_menu_snowmass.pdfIn PDF document text
    • https://gutinevar.weebly.com/uploads/1/3/4/6/134611255/nadefizusemetesal.pdfIn PDF document text
    • https://cdn.sqhk.co/malofavu/hjgjdeU/wolfcraft_spring_clamps.pdfIn PDF document text
    • https://cdn.sqhk.co/losomilodip/ggDghJN/warpath_jurassic_park_ps1_rom.pdfIn PDF document text
    • https://cdn.sqhk.co/lamidipeke/iivvOlh/zedgetm_wallpapers_ringtones_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/paleguvebo/hcRegIX/free_calls_international_phone_calling_app.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/joterige/6916938719.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/kijesezeguka.pdfIn PDF document text
    • https://8b1d1a20-f0f3-43d5-aeb5-704ac988d6c7.filesusr.com/ugd/9dbc1d_007d80f717f94cc79d2e717d048dd989.pdf?index=trueIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_edc4bdbc19bc4299b13d3af5b5f88361.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/jotox.pdfIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_13cde92337f446319638a905435e019a.pdf?index=trueIn PDF document text
    • https://d73c234d-0e3d-497d-8108-d5659bace061.filesusr.com/ugd/58a813_c5b6fdbb254148bc89736a4c3bac2c59.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_off0000cb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB60 5412 bytes
SHA-256: 2ba4fc27554a43c707038d9d5e17948eb5caae64e104e7747b0fbb40acc95752
font_01_sfnt_off0000de02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE02 10188 bytes
SHA-256: 6eced063d376eb3ef2e089200add0ec452b3006a7f2998b8c26a83111ffd4c5e

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