Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fbbe78c622dc727…

MALICIOUS

PDF

82.7 KB Created: 2021-03-20 18:29:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d7d90170a33382f98d3c9c82ada69d44 SHA-1: bd742683542a3c3a5f12efe06bccf81f28742083 SHA-256: 1fbbe78c622dc727bb2c3993b0af9db1707e987928d98fba656802339fd53e52
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URLs, many hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://dugedepap.ru/strik?utm_term=how+to+fix+a+vissani+refrigerator PDF link annotation
    • http://pomulagija.iblogger.org/18409954089.pdfIn PDF document text
    • https://wugepugozufov.weebly.com/uploads/1/3/4/7/134744675/5638086.pdfIn PDF document text
    • https://legoxadev.weebly.com/uploads/1/3/2/3/132302888/rogegozazu-mazati-tivezon-nefapazovup.pdfIn PDF document text
    • http://clobuss.ru/racing_car_game_onlinevfitt.pdfIn PDF document text
    • https://kefawefixak.weebly.com/uploads/1/3/0/7/130738991/tarikimezalogif.pdfIn PDF document text
    • http://electorat.org/885809577059urj3.pdfIn PDF document text
    • https://takatika.weebly.com/uploads/1/3/4/6/134605824/2bf7b4f52c.pdfIn PDF document text
    • https://fasitidepev.weebly.com/uploads/1/3/4/3/134312072/guguruder.pdfIn PDF document text
    • http://puxeguka.iblogger.org/wajexetulowikagogidirozap.pdfIn PDF document text
    • http://fuvafutiku.22web.org/japanese_hiragana_test_sheet.pdfIn PDF document text
    • https://nafogoke.weebly.com/uploads/1/3/4/7/134776139/1065583.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nigojelur.epizy.com/kuzekomejixezitulofuli.pdfIn PDF document text
    • http://relaweki.rf.gd/lazigepu.pdfIn PDF document text
    • http://warunegiluj.rf.gd/apprendre_l_anglais_facilement_et_gratuitement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f38f3bf-a1af-4b08-911d-2b16803ec69c/kixagexofenibaw.pdfIn PDF document text
    • http://podemerobetalax.epizy.com/donidudotibiwozadefugilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/541623c8-ff44-46c1-8042-28357f5a2e06/project_management_apps_for_small_teams.pdfIn PDF document text
    • http://fafaxuz.epizy.com/3478934604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5148752-8327-48e3-831e-150f969209c2/hp_officejet_pro_6835_not_printing_black.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 5084 bytes
SHA-256: 32e45c3a145079b078d2daa7a7a71b463bf51dfccb74a08ff2d4be1b009b44de
font_01_sfnt_off00010115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10115 11196 bytes
SHA-256: 13a6ddc1d8019942168b9b25ec7e0f1492ae62a93aefee1eaaa3dfe494b24c7e
font_02_sfnt_off00012707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12707 16292 bytes
SHA-256: 9b6b90087ad242a037c4abcda3a7e1e6f720f468737e54aa4fd5e99d079103e1

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