Malicious PDF — malware analysis report

Static analysis result for SHA-256 d987d1aec8f91984…

MALICIOUS

PDF

78.7 KB Created: 2021-03-20 06:18:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f3ab5c8f8b8d6cbc533817219734e12c SHA-1: 972408f807dacebfbcaf9000b4fea2ca58e428b8 SHA-256: d987d1aec8f919847d3e579e2408c92947a293383173c1ca0967f018c66457ef
176 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. It uses a callback-phone (TOAD) lure. 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nipisod.ru/wix?keyword=auto+call+recorder+pro+2018+apk PDF link annotation
    • https://tofavasexivefet.weebly.com/uploads/1/3/4/5/134578877/zixemubose-buzuwu-xegatewikofu.pdfIn PDF document text
    • http://distornyup.site/3-6_practice_solving_systems_using_matrices_form_g_answers_algebra_2f69n1.pdfIn PDF document text
    • https://zanokelalugabu.weebly.com/uploads/1/3/5/3/135315143/gogemikobo-tukodogigolekov-dobimezuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422638/normal_605062864ee52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445864/normal_601bd426de3ca.pdfIn PDF document text
    • http://uscarins.info/how_to_pronounce_arabic_words_in_englishod3zx.pdfIn PDF document text
    • http://sale-siberian-force.online/why_starbucks_expanded_internationallyv3vlv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jovekus/killing_floor_lee_child_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/celery_juice_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/how_to_turn_on_bluetooth_on_garmin_approach_s60.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/scourge_of_the_past_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/ti_nspire_cx_price.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/54276233985.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/diranuwajepadujodidosuwup.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/panasonic_viera_tv_app_store.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/7354818487.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/john_deere_3010_service_manual_download.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E7 5192 bytes
SHA-256: 076d4f18b29b9d3f4f7d26149bb7f81878603d19b4c9574f277d717f532a4369
font_01_sfnt_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 13776 bytes
SHA-256: c037b2b41c6ddc2bc3cf6b0b620ee00ca6bbdae92abb748c1fe355177e385db9
font_02_sfnt_off00011f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F91 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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