Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e3e1eb929d5dd6…

MALICIOUS

PDF

106.8 KB Created: 2021-04-06 15:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fc55e8a79aac4b981ced4d456d58c955 SHA-1: 509be805de1d37ea2d9fc49c982050d96733bd8a SHA-256: 88e3e1eb929d5dd6345e344fe7e87db99c163a03d31aae8de287f42d813713d2
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 0.9978

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://botokaw.ru/award?keyword=sholawat+barzanji+lengkap+pdf PDF link annotation
    • http://nomuvafemokin.iblogger.org/6727307065.pdfIn PDF document text
    • https://bosebekepomij.weebly.com/uploads/1/3/4/8/134870535/8461326.pdfIn PDF document text
    • https://vususutuf.weebly.com/uploads/1/3/4/6/134634118/9326465.pdfIn PDF document text
    • https://maparezoja.weebly.com/uploads/1/3/5/3/135321508/4452961.pdfIn PDF document text
    • https://jenifamizoj.weebly.com/uploads/1/3/5/3/135319667/zosusatutedewu_sakodujabox_nepuramudikiko.pdfIn PDF document text
    • https://wopokajam.weebly.com/uploads/1/3/0/8/130874492/6186064.pdfIn PDF document text
    • https://loxuvozuru.weebly.com/uploads/1/3/4/7/134728716/71d97bd23ee264.pdfIn PDF document text
    • https://gogabaxada.weebly.com/uploads/1/3/4/8/134852864/8656713.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1abd15d4-1f91-4c30-b777-09c1bc0d97b2/dafonavabidug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aace0aa5-ffdc-4897-abb5-5fdb84e0da1e/manual_of_section.pdfIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_32ed5cf46b3c4822bcdca7da7c8420d3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/157e614e-9950-450f-8bcc-d3928a5cf198/what_is_atf_4_transmission_fluid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/246a6f04-507e-4970-bf9f-5ba67162bd0c/lerade.pdfIn PDF document text
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_0b7f6ab88e8f40fe99bdaaa0d0d8a27f.pdf?index=trueIn PDF document text
    • http://matazovazer.epizy.com/where_is_the_heating_element_located_on_a_kenmore_elite_dryer.pdfIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_831c2fbe2b214ca9b6c1da048137bee9.pdf?index=trueIn PDF document text
    • http://vatapusaf.rf.gd/slope_intercept_form_line_art_examples.pdfIn PDF document text
    • https://d572dbd6-ec42-402e-884a-3db6daac2318.filesusr.com/ugd/6a558d_0487ede91584429ea2eb177ac42d461b.pdf?index=trueIn PDF document text
    • http://tuvivitir.rf.gd/channel_master_cm-7000pal_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/atf_220g-_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02f8e296-4c12-4be2-83c4-c8f15fc64137/what_questions_to_ask_at_a_grad_school_interview.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/watevobigi.pdfIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_ed5ce72daa5a4a7c8a6457ce1f59495a.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00016bec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16BEC 27692 bytes
SHA-256: c33c6081381d543859cc923aca983a3e42d5b6e696bebcc1f56c7922be2b7b15
font_00_sfnt_off000128fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FB 5648 bytes
SHA-256: 1800a1c6868caa5d7faff3818c15648c40393123131e0eb24afb5eb2c912c0c4
font_01_sfnt_off00013c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3D 2004 bytes
SHA-256: 35cb21fdb618efd7041eee26779fe95fdf0a80cdc9fe6086b0d69ce776a47990
font_02_sfnt_off000145d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D3 11356 bytes
SHA-256: a1dc3e5a4979b86e47a05eb5f6f9d4b98fffeca71ce5147ac3a85d4fdcbf224b

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