Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4787035da324700…

MALICIOUS

PDF

75.9 KB Created: 2021-03-04 22:22:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 06795cb5ef21d49dff61107f8d8c4501 SHA-1: 5f0f671f4cbdfd0d36e2570340d5392181d8902d SHA-256: a4787035da3247000fc737e84842434dba1ccb1503c75c3230154c212b527a0f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://dugedepap.ru/wix?keyword=analisis+de+operaciones+conclusion PDF link annotation
    • http://prodson.fun/rccg_sunday_school_manual_5_august_2020yd69n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454808/normal_6008cd88ed81e.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/94619295491x9vvm.pdfIn PDF document text
    • http://psychologyrelax.xyz/how_do_i_contact_the_ceo_of_starbuckscszc1.pdfIn PDF document text
    • https://cdn.sqhk.co/lajojeletab/cALDgjx/stickman_army_the_defenders_hacked_games.pdfIn PDF document text
    • https://cdn.sqhk.co/nejajevafode/abxbjeP/christmas_tree_template_free.pdfIn PDF document text
    • http://helplnstagramoffice.com/76369157839z1i2a.pdfIn PDF document text
    • https://cdn.sqhk.co/jidulopavoji/fLgeife/download_plus_messenger_for_android_4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388163/normal_602a750b4f268.pdfIn PDF document text
    • https://cdn.sqhk.co/tosijoxopum/3jDhiLm/lupeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_01eef39c7ecc48908c6beeac05ef555a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/070a0538-9117-4d3e-a4f1-7b35350ed330/radizupizototule.pdfIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_85b71c90a4784deb82de51ffd754f910.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a46fbaa7-210d-4ef4-9a65-066daf392970/94430932350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f661fd06-0db1-4d78-8b4f-b5b29cf2ede7/97042245635.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

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 5056 bytes
SHA-256: 8d407eedb2d741fe7017aec84edcf4ac011f0a8a46a01ea23c048334f76a6404
font_01_sfnt_off0000facd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACD 11984 bytes
SHA-256: 9a66061f0c9ae1a183c1fb1bc70fcad682739bc6c8cfa2c460f07fa9fa670f88

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