Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85c977a9f11d0e8…

MALICIOUS

PDF

77.1 KB Created: 2021-06-02 18:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f6ed58cc7c256f0e17ff87721d927e6 SHA-1: 72bdc58d7278fd65dfe304130043fbebdff962d1 SHA-256: f85c977a9f11d0e8f50b7591c7fa4ec5a4037399eb24d150b93a2be11a1a09bc
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on Weebly, suggesting a link farm designed to manipulate search engine results. The embedded URLs and the ClamAV detection indicate a malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links point towards a tactic of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://huntic.ru/pbw?utm_term=what+is+the+hardest+song+on+beat+saber+2021
    • https://foseduvix.weebly.com/uploads/1/3/4/4/134491956/6e90743e67f6.pdf
    • https://cdn-cms.f-static.net/uploads/4381547/normal_5fd974150e48e.pdf
    • https://cdn-cms.f-static.net/uploads/4379374/normal_601f99b54d6a0.pdf
    • https://fupopafesuz.weebly.com/uploads/1/3/4/4/134443157/kamikixozidanudafi.pdf
    • https://vogizezadu.weebly.com/uploads/1/3/0/8/130814341/322120.pdf
    • https://vopilexazum.weebly.com/uploads/1/3/2/7/132740267/fe893443a5.pdf
    • https://kikobuvikivevir.weebly.com/uploads/1/3/1/4/131437815/bewazutesikisalapi.pdf
    • https://dukezowe.weebly.com/uploads/1/3/4/6/134602160/2900747.pdf
    • https://static.s123-cdn-static.com/uploads/4422643/normal_6006a6e65ca07.pdf
    • https://lunafegosewexik.weebly.com/uploads/1/3/5/3/135351611/ad2915ff49.pdf
    • https://cdn-cms.f-static.net/uploads/4418401/normal_606c599393686.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mikabipi.pbworks.com/w/file/fetch/144434520/dosizunuvixonuroli.pdf
    • https://uploads.strikinglycdn.com/files/8e751eae-fb86-4d0e-a568-abedc25fee9c/how_to_get_blooper_links_awakening.pdf
    • https://uploads.strikinglycdn.com/files/b238f62d-ae2f-4791-b007-0950d660581d/monsters_inc_meme_sully_mmm.pdf
    • http://ruwomodanom.pbworks.com/f/4623655928.pdf
    • https://uploads.strikinglycdn.com/files/c460a91b-e571-42b9-bf93-81477061a8c2/hp_photosmart_c7280_ink_system_failure.pdf
    • https://uploads.strikinglycdn.com/files/163f1f6f-b0d7-48c5-8188-e2c699e55cdc/how_to_convert_kilogram_to_teaspoon.pdf
    • https://uploads.strikinglycdn.com/files/bc770527-5aba-46ab-b03f-87dc686df216/aswb_practice_exam_questions_free.pdf
    • https://uploads.strikinglycdn.com/files/f4109ef9-ffc6-406b-a362-1cb07b22f6e2/organic_chemistry_addition_reactions_chart.pdf
    • https://uploads.strikinglycdn.com/files/61147c0d-73f7-499e-b71d-b9d5469a7bbe/how_to_put_out_pine_mountain_fire_logs.pdf
    • http://lufokomarib.pbworks.com/w/file/fetch/144468549/88774900774.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec21.bin
765d063495747d409c2cadfef192b4a7d8a71775aa019d5c49d5251557ac342d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 5536 bytes
font_01_sfnt_off0000fef7.bin
a323a1b8e355ad670cf4b013c5a66bd2b8b3cfbec19bc1d7a52cdcb31089e8ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF7 11068 bytes

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