Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c1b234710c9cf6…

MALICIOUS

PDF

67.7 KB Created: 2021-03-09 00:03:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d5b114f9ba8d5800d07ab782cdcdac2f SHA-1: 2a7d690e992b5adc149994c31170a7bd66287001 SHA-256: 62c1b234710c9cf64b01d201a25fda113dc234d1e41289ed7965e0b47cf1bb43
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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 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://xajibur.ru/123?utm_term=qualitative+research+in+psychology+a+practical+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366987/normal_6008826833bb4.pdfIn PDF document text
    • https://wofexajolevesi.weebly.com/uploads/1/3/5/3/135302186/484980.pdfIn PDF document text
    • http://virepidutajal.iblogger.org/rawozivuburofamukawika.pdfIn PDF document text
    • http://zasaluto.iblogger.org/26310138089.pdfIn PDF document text
    • https://cdn.sqhk.co/vinogusi/diahdgh/14917423018.pdfIn PDF document text
    • https://gurawibozogudex.weebly.com/uploads/1/3/0/7/130739732/basub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464996/normal_5fd9894896fa6.pdfIn PDF document text
    • https://madugonado.weebly.com/uploads/1/3/2/8/132815119/7451410.pdfIn PDF document text
    • https://luzuredero.weebly.com/uploads/1/3/4/0/134016924/gofolazabiwivom.pdfIn PDF document text
    • https://nanowoduz.weebly.com/uploads/1/3/1/4/131414019/105a565605ab9.pdfIn PDF document text
    • http://importants.space/princeton_review_sat_prep_bookgi8cs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417644/normal_5ffe6fd0917f9.pdfIn PDF document text
    • http://punejew.mygamesonline.org/quran_with_english_translation_audio.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473039/normal_60435cd97afca.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/LjbeVU4/snapchat_friend_emojis_themes.pdfIn PDF document text
    • http://theporte.xyz/57799500852iylxv.pdfIn PDF document text
    • http://mitatizizuje.mypressonline.com/bariatric_cookbook.pdfIn PDF document text
    • http://sodaapp.club/herman_miller_aeron_chair_seat_pan_replacement_b_size_mediummnq2h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fusogusobu.epizy.com/how_many_homeless_dogs_are_there_in_australia.pdfIn PDF document text
    • http://wovibojo.onlinewebshop.net/good_aa_beginner_topics.pdfIn PDF document text
    • http://niwimugosaz.onlinewebshop.net/38358972664.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_off0000cbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE5 5556 bytes
SHA-256: 73afeb712e76a4fbad5928a72ced550b3f581546f3361bcd81ad53364e74af0d
font_01_sfnt_off0000decf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECF 10096 bytes
SHA-256: af8b4003ed203ac280cca9f095d54d8e5702776693feceb637e1de19b0249943

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