Malicious PDF — malware analysis report

Static analysis result for SHA-256 f312bc639ce5589c…

MALICIOUS

PDF

72.6 KB Created: 2021-04-05 06:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 029df1a4901979b58f407ca501cce521 SHA-1: 55ed4921c577fdd8e96d5f5f909ce37246385272 SHA-256: f312bc639ce5589cc1d9f37d0519fe4d96ec105894473ea19ce47d95bc6d73a8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=download+eragon+inheritance+pdf PDF link annotation
    • http://xubakonuxejebip.iblogger.org/renemavu.pdfIn PDF document text
    • https://cdn.sqhk.co/ketifoseja/730V0jd/fidowetunekim.pdfIn PDF document text
    • https://cdn.sqhk.co/dikozogub/ghJie9h/21088475810.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/3688835.pdfIn PDF document text
    • https://jakilirimilibev.weebly.com/uploads/1/3/4/8/134862861/4042414.pdfIn PDF document text
    • https://cdn.sqhk.co/tusufawenu/jIihhcy/74044266189.pdfIn PDF document text
    • https://bukemabo.weebly.com/uploads/1/3/4/6/134653237/3860144.pdfIn PDF document text
    • https://cdn.sqhk.co/tedigedubemi/jh4jAii/gospel_music_nigerian_worship_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/wetilusogaki/4VjbmmE/bhoot_aaya_video_song_free.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://larazegabolulaf.epizy.com/election_b_form_meaning_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/214e33be-7ce3-462f-96f1-3e368f3af537/what_does_32_bit_os_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/394b467b-0b4d-4cc2-89d2-ab41c4163c1e/67_lateral_thinking_puzzles.pdfIn PDF document text
    • http://kalogoraretupo.epizy.com/google_trend_report_2019.pdfIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_b0950bffa19645e1bd1fb922cf80fe05.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93288994-98e7-44da-a252-b3a5573a3fbb/how_to_play_football_for_beginners_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46e1657b-cbe6-4a32-b08c-25e78b977bc2/87503853196.pdfIn PDF document text
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_edc819c35865461dae36ea4f1b4f654d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/71a44150-16ef-4c8f-a778-08205e27b672/is_the_shark_vacuum_any_good.pdfIn PDF document text
    • http://zarejumologile.epizy.com/76609335774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c70a4787-ef7e-45de-97fe-04cad4bbb930/repeated_addition_worksheets_for_3rd_grade.pdfIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_70b9bc52b6f6459d96446ea4709752f0.pdf?index=trueIn 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_off0000d1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B1 5120 bytes
SHA-256: 85440b5e2aedada5f50dde1a36d992ca35ce9d82d1bfba9159b895c4ec9bee72
font_01_sfnt_off0000e32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32A 10436 bytes
SHA-256: fddcbd2835c322571ed7f7b6761d4c1ad1e76f4e12c69f239cf057ed5d4ab3d1
font_02_sfnt_off000106eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f