Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb81c39013debf07…

MALICIOUS

PDF

74.1 KB Created: 2021-04-01 16:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 81c1ca9d096164a3f16f6d5781085865 SHA-1: dec2044d3a9e8ff5cd6dd09596c8f15a2b866276 SHA-256: bb81c39013debf07c5f8e42735853a4beb1db14030e1439d9fe9da6ae9e78b76
126 Risk Score

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 0.9998

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 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://botokaw.ru/123?utm_term=guided+reading+lesson+plan+for+2nd+grade PDF link annotation
    • http://pikegupima.medianewsonline.com/65724687184.pdfIn PDF document text
    • http://vevapefin.sportsontheweb.net/nabatusomadesu.pdfIn PDF document text
    • https://lexizade.weebly.com/uploads/1/3/4/3/134368494/besixebutomepuxegob.pdfIn PDF document text
    • http://larediwavokib.iblogger.org/medical_dictionary_english_spanish.pdfIn PDF document text
    • http://vajokopopozikem.medianewsonline.com/business_apology_letter_sample.pdfIn PDF document text
    • https://kisisixixugejo.weebly.com/uploads/1/3/0/9/130969502/1cfdfac84eb9.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/46948336203.pdfIn PDF document text
    • https://fenutirixe.weebly.com/uploads/1/3/4/6/134640366/8264104.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/kudowo/tencent_buddy_emulator_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b9c374c-22b0-475d-b8cb-1d3cc520a511/dyson_dc35_multi_floor_battery_charger.pdfIn PDF document text
    • http://jeborawaleko.atwebpages.com/shakespeare_sonnet_60.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/5714631111.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/functional_deformity_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/aiou_date_sheet_autumn_2019_ma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89ba14b4-0cc5-47d0-98ed-7f679db4cc70/what_are_phobias_examples.pdfIn PDF document text
    • http://nesuninabofoda.rf.gd/gabufu.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_off0000e502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE502 5372 bytes
SHA-256: c3a51f1bea7ae7a9d36eeaa3900808b11aafe39db8e844383f1ac5d367a3757c
font_01_sfnt_off0000f758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF758 10468 bytes
SHA-256: 398d3a5e92a84bd488cb73b093233f0b024ea2bdd8c1b419f385fca84bf1351a