Malicious PDF — malware analysis report

Static analysis result for SHA-256 af83a8bb16d2bfc8…

MALICIOUS

PDF

76.4 KB Created: 2021-04-17 04:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 24c87e5a3e847824ac48f53cdc4d799d SHA-1: edcbc0dee9dc9aeb8760b187554e2002e814b53f SHA-256: af83a8bb16d2bfc812d371ddc332d96e9a640fe6e744e77e36c08dd587ed6faa
146 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by multiple heuristics and a machine learning classifier. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of a callback phishing lure heuristic indicates a potential attempt to trick users into calling a fraudulent support number. The document body, though heavily obfuscated, appears to be related to financial accounting, likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://xezojetit.ru/strik?utm_term=financial+accounting+8th+edition+wiley+solutions PDF link annotation
    • https://tiputanamadavok.weebly.com/uploads/1/3/5/3/135314880/merewoxuwesakuram.pdfIn PDF document text
    • https://tulalesin.weebly.com/uploads/1/3/4/8/134876190/07236f7.pdfIn PDF document text
    • https://faxigokoge.weebly.com/uploads/1/3/0/7/130775726/d549c4.pdfIn PDF document text
    • https://cdn.sqhk.co/lopumilekana/6Zjeiex/sky_kingdoms_store.pdfIn PDF document text
    • https://dowamodugepaxa.weebly.com/uploads/1/3/0/7/130739159/94217.pdfIn PDF document text
    • https://cdn.sqhk.co/lomokubaf/fjdjiih/94478704483.pdfIn PDF document text
    • https://kukanoli.weebly.com/uploads/1/3/4/6/134641169/79ef6d9b8e06.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/chhhhgc/demon_slayer_sword_maker_face.pdfIn PDF document text
    • https://fumewalifo.weebly.com/uploads/1/3/4/8/134884483/mupiwo.pdfIn PDF document text
    • http://xomapometafa.iblogger.org/lagu_senorita_free_stafaband.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dubured.rf.gd/kazijexuwutuzivituga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7a0d464-3692-49ec-a7e4-e872ca5fe63b/10008732180.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa7063b-7bc3-4374-8a5d-0ab061245b9c/liftmaster_387lm_keypad_not_working.pdfIn PDF document text
    • http://vimejiritafed.rf.gd/rent_old_school_cars_near_me.pdfIn PDF document text
    • http://padezaresa.epizy.com/assinatura_digital_adobe_reader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8cf3271-0243-4a94-8161-e07bd8867885/43504819203.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/annoying_alarm_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/74145669402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b53768b-7cee-43f6-bc36-7015d50b390d/bipiduvibifuramener.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/puzzle_games_for_desktop_pc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/nanda_nursing_diagnosis_for_pulmonary_hypertension.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6beec71b-48dc-4d25-ade1-849c7c7ea705/74603601646.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_off0000e78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 5448 bytes
SHA-256: 33590812dad7e61a3343050a7d554e830973eca6a2e90d8ea2baea36f958dd14
font_01_sfnt_off0000fa2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2B 11532 bytes
SHA-256: 967ef78d2dc368c107e017cb3878a8e645db5f93a3c297d00e996fd35e51b088