Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a7b3e8590f73b2…

MALICIOUS

PDF

88.2 KB Created: 2021-03-12 06:44:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 232664c652a2a3f519fe6df6c7bafeda SHA-1: 5c0d75dbef8b83c7596a501367575d7257909f51 SHA-256: 34a7b3e8590f73b22f8e7fa6ad6b7a6fbde24f61ecade64844bafae740716ee5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are designed to mimic book titles or reports, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs, particularly the one pointing to 'crophysi.ru', are likely used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://crophysi.ru/strik?utm_term=1st+book+of+artemis+fowl PDF link annotation
    • https://niloberu.weebly.com/uploads/1/3/0/7/130739427/16dadc0f8a8f.pdfIn PDF document text
    • http://excellent-spb.ru/superheroes_unlimited_mod_1.6.4s9ffw.pdfIn PDF document text
    • http://s7hmus.org/vowels_and_consonants_in_englishoi0ft.pdfIn PDF document text
    • https://mabamigetope.weebly.com/uploads/1/3/4/4/134493328/6e97cf.pdfIn PDF document text
    • https://kuvopesi.weebly.com/uploads/1/3/2/3/132303138/gixaradalizam-wuramagaw-gokukixobezo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rimepusox/bujavofev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea42cfa4-e812-4e3f-b339-3023e630368f/covid_health_policy_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/android_auto_non_funziona_navigatore.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/91860014689.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/report_on_capacity_building_activities.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/51098711774.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/puma_goalkeeper_gloves_size_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50616f27-bcd3-476e-b55c-0ac55101f86c/42310039232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e111df7-e6df-4e8f-b79e-531e4c859065/bujesafopik.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/98335826671.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/dbms_stats.gather_database_stats_12c_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f14076c-0920-4aa0-a5c6-ce6f2f2fa530/mackie_1604_vlz_pro_dimensions.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/41236463157.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_off00011c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C50 5164 bytes
SHA-256: 926a2a4da85a5873fad217f006a7b0229d4cb6806569d9037597211d05919e3b
font_01_sfnt_off00012de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE3 11208 bytes
SHA-256: f58e3870e78b25e6e1b80013ddaf2f7ce76f63ffbb6443c1209578ff651c15d4

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