Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d85c01213615280…

MALICIOUS

PDF

74.2 KB Created: 2021-04-21 04:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 783cafabde2d164ea755ff9219cb7c3e SHA-1: 167e8b3010dcd7a5b1f12e48fc46f45b0ab48298 SHA-256: 9d85c01213615280f165f5282c018eec7bdec9a079ec086c8087092f9e9479ba
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 0.9997

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/strik?utm_term=sony+bravia+32+inch+tv+wall+mount PDF link annotation
    • http://alsamcctv.com/58074619707aa3x4.pdfIn PDF document text
    • http://bigigog.22web.org/html_2_nodejs.pdfIn PDF document text
    • http://scrlt.xyz/alan_walker_faded_piano_sheet0irbt.pdfIn PDF document text
    • http://help-business-media.com/resumen_del_arte_de_la_guerra_de_sun_tzu_por_capitulosa645p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_529224936d3b453b89cea9e7e138e8b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7036047-44b3-406b-9cbd-44762de7987e/borges_ficciones_english.pdfIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_4862ecd84beb4754933a7feaba8f7d93.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3276d98-fc97-4716-9c75-b008ad5561ba/91187541714.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/61008572536.pdfIn PDF document text
    • https://466f9527-ada3-48b4-ac0c-4ba5546996ca.filesusr.com/ugd/a4b6b9_f3bb5271990a411ba072915911ca18be.pdf?index=trueIn PDF document text
    • http://xesogopobatobop.epizy.com/amazing_grace_piano_sheet_music_free.pdfIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_b9b003242fbb41d59214a602aa6328a7.pdf?index=trueIn PDF document text
    • http://dusekamalebe.rf.gd/dekibonerilip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c60d2b99-8627-4975-8071-20170e859a68/94316228020.pdfIn PDF document text
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_b625e5e7bf544709b278d9272c17854a.pdf?index=trueIn PDF document text
    • https://3796e7af-74f6-4269-b4b1-c98d6d9a2df3.filesusr.com/ugd/169b5e_266e8bf7f8604db7819ade39948ca5f0.pdf?index=trueIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_fe68d2a06f64497d888bdb3d4a80404d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/love_story_theme_song_piano_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/how_to_turn_off_viper_car_alarm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88422645-0e1c-41aa-b1a1-4feb0e10d2fd/tecknet_mechanical_keyboard_review.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_off0000e3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 5656 bytes
SHA-256: 399f170952aaa417f00ee38aa6488bcde47e799cf7c3481fa9411957a5ecb714
font_01_sfnt_off0000f6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 10796 bytes
SHA-256: e7a271e80268d307c600b925a2156273dfa0848affe7149c9cf512ad88f6c38e