Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a9e22832ef4d3e…

MALICIOUS

PDF

79.7 KB Created: 2021-06-11 04:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 684ae3a9062aad3b1bd67012129447f4 SHA-1: 66294c2a146aefbf1ea47a88a7464b0f21804fbb SHA-256: e3a9e22832ef4d3e6bf7bef0f465aaddea2a17f9788b62d1cea996f8aea45a7e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting or redirectors, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or ad-fraud campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/pbw?utm_term=possessive+adjectives+exercises+online PDF link annotation
    • https://xasugalepo.weebly.com/uploads/1/3/4/3/134311154/4272958.pdfIn PDF document text
    • https://filuwanukolo.weebly.com/uploads/1/3/4/8/134874182/9777280.pdfIn PDF document text
    • https://nirawulef.weebly.com/uploads/1/3/4/3/134324477/pibefadutuduvi_sajuwopokapixe.pdfIn PDF document text
    • https://miragitoketulo.weebly.com/uploads/1/3/3/9/133997248/2388848.pdfIn PDF document text
    • https://redunexodozik.weebly.com/uploads/1/3/0/8/130814050/9471987.pdfIn PDF document text
    • https://kukonite.weebly.com/uploads/1/3/4/6/134611202/325cab50a6f5.pdfIn PDF document text
    • https://gotagifegu.weebly.com/uploads/1/3/1/6/131607164/be966.pdfIn PDF document text
    • https://bokowamimufap.weebly.com/uploads/1/3/2/7/132712050/luwagun_rumusuvetadu.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://uploads.strikinglycdn.com/files/f67a5904-77b0-4e63-bc4d-6c1bd55cad3b/text_features_3rd_grade_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d69c7ee-9ac2-4086-bae6-27df5747d439/why_my_tv_screen_is_black.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab437694-328c-450a-a3c8-c803908a7982/what_is_comcast_ref_code_s0a00_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/849d0227-e276-4418-b946-a9a280247a67/american_government_14th_edition.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/f/oscillations_and_waves_class_11_notes.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144422367/direct_and_indirect_expenses_meaning_in_hindi.pdfIn PDF document text
    • http://sawanixum.pbworks.com/f/lojunobobajosopazakaralol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ef13e00-8fd6-49a5-adb9-e327ade10af3/70936270759.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1739096c-7bd6-40bc-af3c-6ec989424646/25793792767.pdfIn PDF document text
    • http://zuvuzut.pbworks.com/f/krte_ilahi_mevlid_mp3_indir.pdfIn PDF document text
    • http://varulemenel.pbworks.com/f/guided_meditation_script_for_anxiety.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf9adfdf-3c80-4a5a-9ac4-a8dd6315c3d2/tekojenasoditejokej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d54eb7c-90a0-4987-ae87-186c4344a2ff/the_sneetches_and_other_stories_full_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c5ca24b-97c2-4906-b67c-7f6552b7ea2b/bidesudapaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaff7699-2efd-415c-8b48-7bce37569029/rujagenegezowulufejaw.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD800 4924 bytes
SHA-256: 391056af3371cf4729c2e0662e1ef346bcee5bbe965a39113dacc8cf34291c6d
font_01_sfnt_off0000e8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D5 10724 bytes
SHA-256: bb75e9109d814baa4955923745480cb9fa94e5b79374054393668543b951dd63
font_02_sfnt_off00010d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8B 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
font_03_sfnt_off000122b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B8 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

Open this report in the interactive analyzer, or submit your own file for analysis.