Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a3884605cf8554…

MALICIOUS

PDF

89.1 KB Created: 2021-03-21 08:56:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 82643c6f1727ee6265df2e4a05d4c9eb SHA-1: 057a212ea856da42a70eec27ad8421965f98d1f3 SHA-256: a3a3884605cf855470c6af71c5c71768a68b5b9d92add9a3370f9dc5f00482dc
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially harmful websites. The presence of embedded URLs and the nature of the heuristics suggest this PDF is part of a phishing campaign, likely using spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/wix?keyword=bdo+imperial+alchemy+worth+it PDF link annotation
    • http://gijofabenetawix.66ghz.com/74581753530.pdfIn PDF document text
    • https://marabobufazezi.weebly.com/uploads/1/3/5/9/135992859/5ef29d2e81d1bda.pdfIn PDF document text
    • https://kafunonedejo.weebly.com/uploads/1/3/4/6/134662894/renixarawema.pdfIn PDF document text
    • http://guromufupadaf.iblogger.org/clustertruck_free_mega.pdfIn PDF document text
    • http://ilook.market/best_scene_from_billy_elliotrj41g.pdfIn PDF document text
    • http://semengergel.ru/paul_wheaton_rocket_mass_heater_design4bd0u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bokubipojofoji.rf.gd/neteller_mobile_app_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/38734100874.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64409df9-0d5b-4f7e-bbb7-f6ef765d9761/how_much_does_chick_fil_a_pay_per_hour_in_texas.pdfIn PDF document text
    • https://b7f5b04e-b247-49a4-9dc0-39f0c843ec09.filesusr.com/ugd/b56f86_ff77a8018ae546d98173b87dc4415ce1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/fexasezu.pdfIn PDF document text
    • https://4ab51db4-2ab9-4ce7-8cf9-a7235cd4f8a6.filesusr.com/ugd/c6359c_b2479d6938b049808e83bd09a7e19264.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c36523c-5267-4c04-8f8a-5311320095e3/conair_steam_iron_walmart.pdfIn PDF document text
    • http://zoribele.epizy.com/41800850435.pdfIn PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_df84cb20bb5849808fdf16155caaa1b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f04724a-2358-4693-901e-2e95139507f5/82998428128.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/guess_the_game_answers_casino.pdfIn PDF document text
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_24894ceb2f68489e9227bf957904f20d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/logical_framework_logframe_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11185 5060 bytes
SHA-256: 1701e96edc0a1bdd2d0ceb344f0efe2c7cd3e389392ae88fe1017eba677bc176
font_01_sfnt_off000122cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CD 11244 bytes
SHA-256: 7148c572a30f73173700c769440f69b474b638fef575e155111751c218316936
font_02_sfnt_off0001493f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1493F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333