Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a05158935e4b0ba…

MALICIOUS

PDF

74.1 KB Created: 2021-03-20 17:07:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6f618eac4a87c42bbecb31e37201015f SHA-1: 9a9aabddf7d02c86ae58a4a2b2768a256ea17d55 SHA-256: 7a05158935e4b0ba1aeda2812e1b07ae382404d9e62829b339a21b2285cff893
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/aws?utm_term=the+how+of+happiness+apa+citation PDF link annotation
    • https://faxusonugavipil.weebly.com/uploads/1/3/4/7/134741565/golisuli-bisaxerulu.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/voltage_regulator_theory.pdfIn PDF document text
    • https://tekemuwuva.weebly.com/uploads/1/3/0/7/130775778/benanefizuro.pdfIn PDF document text
    • http://madokedaxemosu.22web.org/mobylette_peugeot_103_spx_a_vendre.pdfIn PDF document text
    • https://rifuxegu.weebly.com/uploads/1/3/4/5/134525143/lugijasavur-rudozi-vebefefikezom-bexevarakani.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3d7f43e-289d-4e79-8193-090665ab16b7/honda_civic_power_steering_fluid_change_interval.pdfIn PDF document text
    • http://rakejobik.epizy.com/business_agreement_template_between_two_parties.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1c82302-ff5e-446a-99a0-60fd69554940/susunanoxuninamudibemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caaf9825-d34e-4ae8-bc5b-a31a80c48032/fender_champion_40_review_ultimate_guitar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a6054dc-f226-4e62-a188-ccd142ad9041/nikon_p-tactical_.223_3x32_bdc_carbine_riflescope.pdfIn PDF document text
    • https://1ee34b3e-bfcb-4e25-b227-79ffd44eef10.filesusr.com/ugd/9d5096_08434952b87a4bc38b7a394a74be7b1d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d41a696a-1905-4079-981d-8cb168e44e92/the_innovators_dilemma_clayton.pdfIn PDF document text
    • https://dc010c70-835d-4b56-8cb0-1e1bda7cab64.filesusr.com/ugd/fb576b_63fdd3101978459ebad9827a901f6e24.pdf?index=trueIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_79d1bae2696c41baaa502c6d510648ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cc462be-a628-4e7a-860e-cd10c1b836e6/printable_mental_status_examination_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96e9dee7-9f3c-4d48-9aea-2096f921f857/33324918054.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6ED 5016 bytes
SHA-256: c3b5e6fc42bbf3a0f98c58303efa3f90b4b02868d5e6ba46e0861dc3aeedd556
font_01_sfnt_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 2920 bytes
SHA-256: a826cd15759f1829322e48458c95f716dcebf2f8ccfe96592ead52aedcdb4a70
font_02_sfnt_off0000f3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 11476 bytes
SHA-256: 164eed360f98ac6dd27b607d0552b6725ba6f9a79c23bdea1795fd4353e57452

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