Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3a1ca67f5e8aa5…

MALICIOUS

PDF

85.2 KB Created: 2021-03-10 19:42:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7e77ea3caa2d40dae42b0f6664fe5d60 SHA-1: 1950133ef3af1149813ace6fff1fc6ab99b71848 SHA-256: 1a3a1ca67f5e8aa51ad2c5b6f7706ddcc0db3f8818dc91a1aa424e0a406fb007
244 Risk Score

Malware Insights

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

This PDF was flagged by multiple critical heuristics as malicious, including a redirector link and a large link farm on disposable hosting. The embedded URLs suggest a phishing or scam attempt, likely designed to lead users to malicious websites. No scripts were extracted, but the PDF structure itself is indicative of a link-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=group+d+answer+key+hssc In PDF document text
    • https://cdn.sqhk.co/mipijotom/Rhaibjc/59080371255.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/TgjDihc/gutscheine_media_markt_august_2020.pdfIn PDF document text
    • http://peludofnor.fun/bobaxodovezeyeh1x.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/12845215077.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/62443564674.pdfIn PDF document text
    • https://cdn.sqhk.co/zexupibo/K3XhfkQ/.pdfIn PDF document text
    • http://pinegobojefo.getenjoyment.net/32240701065.pdfIn PDF document text
    • http://devgm.design/architect_scale_rulerwgclh.pdfIn PDF document text
    • http://egrn-order.online/23873724461ws3ct.pdfIn PDF document text
    • https://cdn.sqhk.co/gepabafi/mjd2YJl/anime_manga_coloring_book_games.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugewameru/iFA9GIG/ring_a_bell_idiomatic_expression_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/virawamimozi/hiLjbie/36846918455.pdfIn PDF document text
    • http://eferevole.com/what_plants_are_unique_to_australiat383n.pdfIn PDF document text
    • http://pimesizawox.sportsontheweb.net/jack_reacher_never_go_back_netflix_canada.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
    • http://fedorahosted.org/lohitIn PDF document text
    • http://rogofideb.onlinewebshop.net/59238124487.pdfIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_f06ac426e741478bab98c593b4cf6773.pdf?index=trueIn PDF document text
    • http://gototura.myartsonline.com/the_chaser_by_john_collier_twilight_zone.pdfIn PDF document text
    • https://761e60ea-5e0e-4c43-b4c2-f6a9045c608d.filesusr.com/ugd/545033_c349fed3e14b4689ac8faf8c066d3732.pdf?index=trueIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_fbd789d39424437db6ffc2493b12f404.pdf?index=trueIn PDF document text
    • https://efe523a3-d756-4f55-ba91-412f3a718e00.filesusr.com/ugd/236571_9cd7955ca4bb4d7d9f6e838e4c791c49.pdf?index=trueIn PDF document text
    • http://kavibajegis.onlinewebshop.net/medicinal_chemistry_research_articles.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 5172 bytes
SHA-256: b3be8ef864066d360ec0a7c5c8ed28e84fe688fe0b4cda8d832cda75134190b5
font_01_sfnt_off00010482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10482 12212 bytes
SHA-256: 162e007285674183b66240656e8c7a6ccc1953c0367a05f24e64a93c2104896f
font_02_sfnt_off00012cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEE 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
font_03_sfnt_off00013aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEE 2832 bytes
SHA-256: ee8afa51e50492bdf4d25b6b01818d2021856a0eb5271b70f188e6d094f25891

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