Malicious PDF — malware analysis report

Static analysis result for SHA-256 875b25046c1d0144…

MALICIOUS

PDF

83.4 KB Created: 2021-03-08 21:08:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b6c5a8065a8da5704837f4c45dd2498d SHA-1: 2046b03ccfc4c59d90cdc5074fd77bf44bd1cfde SHA-256: 875b25046c1d0144d509ed52b645a78151d0f449342f8854b1601e024d47c9b5
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, embedding numerous external links, many of which point to disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or SEO spam. The embedded URLs suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://seumenha.ru/award?keyword=que+es+un+antipiretico+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409619/normal_5fc97a6b3b70f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417656/normal_60075b3c8af15.pdfIn PDF document text
    • https://ximavubakalik.weebly.com/uploads/1/3/0/7/130776508/9612652.pdfIn PDF document text
    • http://kipokefurur.mygamesonline.org/39968361267.pdfIn PDF document text
    • https://xofebigile.weebly.com/uploads/1/3/0/7/130739964/7906891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417414/normal_601a300dd493c.pdfIn PDF document text
    • https://koduxiwarutuj.weebly.com/uploads/1/3/2/7/132740502/dexata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423453/normal_60233f3c7e6da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381547/normal_5fd0da3d73355.pdfIn PDF document text
    • http://sevoxotedeki.medianewsonline.com/pretty_little_liars_book_4.pdfIn PDF document text
    • https://dudobafileziv.weebly.com/uploads/1/3/5/3/135331993/pesadol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462696/normal_5fc7a858411b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485301/normal_6043b98f1455f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447460/normal_6009017a81c50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468836/normal_5fe833c48bacb.pdfIn PDF document text
    • http://doxalasi.mywebcommunity.org/how_to_test_if_someone_can_follow_instructions.pdfIn PDF document text
    • https://murasujudadalox.weebly.com/uploads/1/3/5/3/135338307/3342542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455876/normal_5fd79bae84f24.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
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_fa11610664cf4dd292e0b00af29be94c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1efb4ea1-a1f0-452c-be75-0aa857c95e6a/hoover_twin_tank_steam_mop_replacement_pads.pdfIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_3caf04e295af46ec98c142b67515660e.pdf?index=trueIn PDF document text
    • http://ziwemasux.myartsonline.com/76040891747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bd9fddf-c8fc-4e8d-bc0e-43f9938451d4/nwn_world_of_greyhawk_forum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f570755b-4f73-41a8-8196-3469c0ae9716/the_river_cafe_nyc_menu.pdfIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_44644bb4419b48f89eebc10e7567819a.pdf?index=trueIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_49fa7b8dcf444551bc935fdac7bc1221.pdf?index=trueIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_57a995f258004a5cb6df0304bd1f0964.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebcdf7be-0369-4042-b139-e85a4f3e75ac/how_much_is_a_monthly_bus_pass_from_nj_to_nyc.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_off0000f880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF880 5060 bytes
SHA-256: 0adfe176385e08bd7e05e706547091d05ee782a1087d3870bf1aa621ab91d973
font_01_sfnt_off000109b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B9 11732 bytes
SHA-256: cf6552db63f60028c1293a5967e4d0444e5c3343ef8d3c5f4885eb82a9cf91dd
font_02_sfnt_off00012ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF4 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e