Malicious PDF — malware analysis report

Static analysis result for SHA-256 26708734044201e1…

MALICIOUS

PDF

84.4 KB Created: 2021-05-16 03:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0b021203240e3d1a737497378ec2f7cb SHA-1: b108be2116c1881b97200e46558b3c3a1024a6c4 SHA-256: 26708734044201e1db9abde51b3dc13764280dd47b3285338ed86f65f9f2fd78
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 0.9996

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=diary+of+a+wimpy+kid+book+collection+1-13 PDF link annotation
    • http://semazolowogafoj.22web.org/91886942402.pdfIn PDF document text
    • https://cdn.sqhk.co/ramidazumiko/ibXjjo3/96848923649.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498983/normal_5fd3ab3383edb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427086/normal_60541a7ece323.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/Nu7ggje/faith_family_church_wes_feltner.pdfIn PDF document text
    • https://cdn.sqhk.co/votijavos/agdhtwz/dusttale_sans_fanart.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376372/normal_600200d61bf20.pdfIn PDF document text
    • http://piwegowukatugib.22web.org/niluto.pdfIn PDF document text
    • https://cdn.sqhk.co/gegefemorosu/iakgeB6/alan_walker_faded_piano_sheet_music_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371806/normal_605ce76616495.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480753/normal_606d6c946e49e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456399/normal_6060148131fe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501204/normal_602f48070b35e.pdfIn PDF document text
    • http://rerikadarax.iblogger.org/57468317581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368492/normal_606e904006e9e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_c407a2c472454806b6d75cbfa979848e.pdf?index=trueIn PDF document text
    • http://vowaxuf.rf.gd/xiwikane.pdfIn PDF document text
    • http://gumigojozupe.epizy.com/barnaba_new_song_free.pdfIn PDF document text
    • http://gorosojipi.rf.gd/where_is_addison_rae_parents_from.pdfIn PDF document text
    • http://xavisijividefo.epizy.com/fisuxexotelovubagej.pdfIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_c241f18134ce4eb1b5779c555596b999.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001087f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087F 5768 bytes
SHA-256: c2bad9b0e2558fe8d9c2f21725a30e29eff136a7bb2c5b9f0326c579ad9795d1
font_01_sfnt_off00011c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3F 11692 bytes
SHA-256: 8d0c61c122cdebbb020288bcca11b9ce29c4a402d8374da027f937d8989d2131

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