Malicious PDF — malware analysis report

Static analysis result for SHA-256 28029f43506c5a59…

MALICIOUS

PDF

107.9 KB Created: 2021-03-12 12:51:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9301e2ae09ed4fc98b6b57f8e9e68e1f SHA-1: 9709f9b78ecc6c23436edd517115deb7bdcf2039 SHA-256: 28029f43506c5a598eeca556236d5770d2b4da2ee39dab63aed4bd281636e099
186 Risk Score

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 0.9995

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://resalured.ru/award?keyword=archival+research+methodology+pdf PDF link annotation
    • https://cdn.sqhk.co/zivuronufepu/g9gjtzs/female_bearded_dragon_for_sale_near_me.pdfIn PDF document text
    • http://huaweistoreukr.xyz/hp_laserjet_p2015dn_driver_free_download_for_windows_7p0k72.pdfIn PDF document text
    • https://cdn.sqhk.co/juselivo/aCUV5vl/dark_side_bishop_briggs_lyrics_traduction.pdfIn PDF document text
    • https://cdn.sqhk.co/xelajuwodaf/mhacWp2/53703901910.pdfIn PDF document text
    • http://dress-russia.ru/56747103633qrtwk.pdfIn PDF document text
    • https://cdn.sqhk.co/xojafimib/bhgpgeQ/shoot_em_up_movies_the_deele.pdfIn PDF document text
    • http://fidafevemikiwe.mywebcommunity.org/ottlite_desk_lamp_costco_canada.pdfIn PDF document text
    • http://kuliwegi.sportsontheweb.net/notebook_acer_aspire_one_windows_10_display_driver.pdfIn PDF document text
    • http://ramuwesitavoz.mywebcommunity.org/nevabawevodike.pdfIn PDF document text
    • http://idealica-italiauficiale.website/jopefasunalaxojakonawm5s53.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e91fd7fe-782b-4baf-9007-7310148b3dec.filesusr.com/ugd/3254bf_05627c473d0b441390f490d2be46c895.pdf?index=trueIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_cf4e34153ceb4c40a4b9556396c3db1c.pdf?index=trueIn PDF document text
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_c6670d5acbd04df9bf39ca451c4a6e50.pdf?index=trueIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_0e79c1faefeb417ea1aff4220403210a.pdf?index=trueIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_171a20c896d7460285df9f825c88233e.pdf?index=trueIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_952af3223cf042c18dea02910a7030e2.pdf?index=trueIn PDF document text
    • https://443275ec-395d-4f86-84c9-2ed7a250e117.filesusr.com/ugd/7d471d_1e869eaddfc7470aa650904ba0fe6996.pdf?index=trueIn PDF document text
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_d06f91fadd9b46008b4164cc26cfa292.pdf?index=trueIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_646388dfe1c84316a9f07cc1109000da.pdf?index=trueIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/saxon_math_course_1_table_of_contents.pdfIn PDF document text
    • https://78a3f932-2eca-4366-91b9-d52a2f3c5f58.filesusr.com/ugd/a586f9_7ae0a93bdd1a47cfa49dfc95c0c32ebf.pdf?index=trueIn PDF document text
    • http://sukokovevaz.atwebpages.com/pasaxomitoz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AEA 5720 bytes
SHA-256: 56754da7f60c3cdd0ccadf15fae841736496a0b598d7767505701d53d9c4700d
font_01_sfnt_off00017e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E45 10276 bytes
SHA-256: c0f7bccb8d8867ae48285b6c16fd09575d6f6ac95e08d6e0a2a22cf5fed90b52