Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50d8cc94be2c750…

MALICIOUS

PDF

69.4 KB Created: 2021-03-08 14:43:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 636cc8c67149396fa9f6dfb17088a97e SHA-1: 636133307ddd48871200ad30b7c7ca0aad812cb0 SHA-256: f50d8cc94be2c7508d27cbc60fb0680ae78b00c2d6879e4bec506dd067749e11
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting it is part of a link farm designed to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bologen.ru/123?utm_term=queen+size+bed+sheet+means PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464529/normal_603b4bf2a7262.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369794/normal_60460752a2011.pdfIn PDF document text
    • https://cdn.sqhk.co/bejamisokepu/idihrjh/paypal_debit_card_apple_wallet.pdfIn PDF document text
    • https://cdn.sqhk.co/pixisuja/ogeRMji/clueless_characters_costumes.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/gyggjgH/black_friday_sale_online_clothes.pdfIn PDF document text
    • https://cdn.sqhk.co/veladaxuzeba/HISKije/ledoxerodezebokenone.pdfIn PDF document text
    • https://cdn.sqhk.co/wareberefiz/ihrx0mo/piggy_loves_food_diet.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/pifHjfo/62025336373.pdfIn PDF document text
    • https://cdn.sqhk.co/tujarazimok/gc8hhjj/1862466725.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/hfvPjcv/fundamental_orders_of_connecticut_quizlet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410462/normal_6007292b1bd63.pdfIn PDF document text
    • https://cdn.sqhk.co/rajunakeb/1xA3KZt/velilubidedul.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/93a389ae-3524-444f-85d9-8d07342f0a29/77113586350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e3f3184-9370-409b-88ac-df65ec571a32/louie_giglio_free_bible_study_goliath_must_fall.pdfIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_946181b548264b5ba2f0f52a42e621e2.pdf?index=trueIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_c0a6eaedf851401ba912b03fef3f28ef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/73a32985-36f7-4789-b6ad-5cc3519e9652/67688532633.pdfIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_0cc649e83c0d41b990e5159f35b64a53.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae1eb724-9de3-46c8-a75c-38ea899908c5/18697554222.pdfIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_50a46136eff644b795b1638b081092d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f0f8af6-950c-432d-a732-21f3ab46cd27/best_vba_programming_book.pdfIn PDF document text
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_79606a41e6da4f32bee682954ae19f34.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b992889f-c7cd-4cd6-9057-8e8d52457a39/badojotuzufadot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0b2e2ab-3c50-4e9c-b328-95241f550ad9/act_test_booklet_order_form.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_off0000d4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BE 5188 bytes
SHA-256: df4978b85200bb519651d90a383ab8a708c42bb3b37fd6061e3b557d72e712d1
font_01_sfnt_off0000e63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 9924 bytes
SHA-256: aba0315a1d18ab68f7c42c4c7143c7712a20cdc736b107a407e1532cc15e5538

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