Malicious PDF — malware analysis report

Static analysis result for SHA-256 80ceab6b4ab98aa8…

MALICIOUS

PDF

75.2 KB Created: 2021-03-30 18:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4610130c66afd859d5947386c52f3337 SHA-1: bd5b7f8d5aa86f1cae37193c524cfd2a93310748 SHA-256: 80ceab6b4ab98aa8eb4c4b2918f088fc25a27ac86bc033ea8316d081538dc38a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, characteristic of a link farm or SEO spam. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to disguise malicious content as a 'Paris metro map zones pdf'. While no scripts were directly extracted, the heuristic 'PDF_SEO_LINK_FARM' indicates a high likelihood of the document being used to drive traffic to malicious or spam sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://pelibifir.ru/award?keyword=paris+metro+map+zones+pdf PDF link annotation
    • http://xanuxif.22web.org/22071079098.pdfIn PDF document text
    • http://momentikshop.space/litemunesifekofetoreff44s0.pdfIn PDF document text
    • http://myyshooop227.site/zadipepoxuwruous.pdfIn PDF document text
    • http://dokuloraxu.22web.org/cengage_maths_calculus_book_download.pdfIn PDF document text
    • http://lg-copyright.com/368242928575fz6l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nebugobebakejef.rf.gd/79778949894.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/climograph_worksheet_garrett_geography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14aa1c50-0aff-440a-8119-dbb316631c16/95208904647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33652528-48e0-428b-816b-6a8581d2f04c/13717464999.pdfIn PDF document text
    • https://c93e3e17-565c-496b-95a0-45fea83b015f.filesusr.com/ugd/cd9bb8_6033510732f04798899f64cfe9bdf6b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dc719ae-f162-4470-8d67-c0ed821badb0/big_blue_live_stream.pdfIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_04b2d713ddff4b13b9017bfb18bd9c30.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/tefodit.pdfIn PDF document text
    • http://toxisokipefofo.epizy.com/one_calculator_multifunctional_calculator_app_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/478d7aab-0904-4beb-bee5-08c7393f5335/mamba_max_pro_motor_limit.pdfIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_06842d04c3144ce39d678bd5360f0e0b.pdf?index=trueIn PDF document text
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_d73d4fb6088f44f4ba8045f9a726da37.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fc87b07-c163-4bac-9e78-c542eebb3260/spotted_lanternfly_what_eats_them.pdfIn PDF document text
    • http://dowulutidapewu.epizy.com/3005790540.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_off0000e8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B0 5208 bytes
SHA-256: 146272be6f5d84fc0ee41ade64263366cbe9e80e48f1532a9875f4e0f6123538
font_01_sfnt_off0000fa5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5B 11076 bytes
SHA-256: b21862ce15db49a595cbb116b63b2497bd3841f204d66cda5d5332e1101b9417

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