Malicious PDF — malware analysis report

Static analysis result for SHA-256 2deec8ddb6e63154…

MALICIOUS

PDF

77.1 KB Created: 2021-03-20 13:36:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8166bf0c2cfb21e8694425f77904bf48 SHA-1: ef4a22e61aab58fd1a15301608e2d56614033bab SHA-256: 2deec8ddb6e63154ae9e6be3d14139a3708b6679334334db1497cfdf49e56824
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://jacksth.ru/strik?utm_term=what+to+expect+during+bariatric+psych+evaluation PDF link annotation
    • http://zawugudumi.getenjoyment.net/zonaguxu.pdfIn PDF document text
    • http://fejiximodanu.mygamesonline.org/hp_laserjet_2055dn_toner.pdfIn PDF document text
    • http://cetapp.xyz/napugazebizamaxuwecslca.pdfIn PDF document text
    • http://tunewejewuz.mypressonline.com/muvakujovudoliz.pdfIn PDF document text
    • https://wonulabanasilod.weebly.com/uploads/1/3/1/4/131482851/6d471c3abd76e1e.pdfIn PDF document text
    • http://steblin.pro/haloalkanes_worksheet0sp68.pdfIn PDF document text
    • https://guxitodek.weebly.com/uploads/1/3/1/6/131637279/7061027.pdfIn PDF document text
    • https://gazapaxinu.weebly.com/uploads/1/3/4/4/134475358/fegurixigajo_pilepoxu_funuwex_zugapijoba.pdfIn PDF document text
    • http://sodahub.pro/detailed_summary_of_the_husbands_secret5ziw3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_e23a92d8d9be4ef6aa31a2eedfc269d3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c20d203a-0b1f-4536-8aca-6ec116b1dc4e/modal_verbs_list_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5102099b-086c-43dd-9122-6d7f99c8ca7c/28122221685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac1818c4-3a15-46c0-bcbe-16611438b5f4/99683627660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4702cfd-f6ec-4bea-a4ee-94eab8bab63c/68198406789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/082ce3b5-0b3f-4816-a641-8662a5e0b7b3/how_do_i_find_my_new_ham_radio_call_sign.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb552720-22b0-4a40-bb3e-a7fd9fc15a5d/mevidufavirosubekomuzub.pdfIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_c1baf020bcd549aab169c56b7d6089c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff756d5d-50e1-4af0-ab5c-95c8cabbe256/matricom_g-box_q2_firmware_2.2.1_download.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_off0000ef54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 5716 bytes
SHA-256: c1098e7d03fb1075525d37a357b7fb3b6146407825d430605197d78b1c2315ce
font_01_sfnt_off000102d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D8 10708 bytes
SHA-256: a87a49903f3fe256512cb7978eb02bc6c33af491ad6532965982c41f3770c3c1

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