Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b75be89c265d3df…

MALICIOUS

PDF

74.7 KB Created: 2021-04-05 11:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 293b2eb1635cdec2dc19adc102f08987 SHA-1: 88dade76ff4cc40cb516a6bd03eb353b4ed6412f SHA-256: 1b75be89c265d3dfc95462554774e00fed9fc31aa9c27535aca5551b7186754c
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 0.9999

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://mezovuduw.ru/award?keyword=biography+outline+pdf PDF link annotation
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/zadikadagok.pdfIn PDF document text
    • https://kisuwirabavaruz.weebly.com/uploads/1/3/3/9/133999170/wolasikaxex.pdfIn PDF document text
    • https://fezugewibopav.weebly.com/uploads/1/3/5/3/135346468/4939699.pdfIn PDF document text
    • http://bamiluzigu.mygamesonline.org/can_stress_trigger_anxiety_attacks.pdfIn PDF document text
    • https://mipoxijal.weebly.com/uploads/1/3/4/7/134709746/dasufu-basaxuwev.pdfIn PDF document text
    • http://wigageturuv.mywebcommunity.org/eagles_hotel_california_lyrics.pdfIn PDF document text
    • https://lokanasa.weebly.com/uploads/1/3/5/2/135299929/4505157.pdfIn PDF document text
    • https://guxitokos.weebly.com/uploads/1/3/2/6/132681611/2484263.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sefowolo.atwebpages.com/jodesiriferoze.pdfIn PDF document text
    • http://kenesowozowojaw.myartsonline.com/judul_skripsi_akuntansi_perpajakan.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/parawumorelarareruvaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55354e01-aa4f-4922-bc0a-5ac6ef08b038/44794061828.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8ff6013-ffe7-408e-bb5d-ae7c161b1dd9/57827360491.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/baby_boer_goats_for_sale_in_pa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f45327-ccde-4d62-89a4-526d23c72e18/224_valkyrie_78_grain_barnes_tsx_load_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b1d4da3-b1a4-4196-86ea-d43701dd633e/darukivawidojuga.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/sijabulasisa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 5276 bytes
SHA-256: 7c1aea0f6e06e79a4606aca1720d369303e065044c6cb942e1c6631d02c427e1
font_01_sfnt_off0000fb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 9816 bytes
SHA-256: b2bbaeae28f457b2e16da796e21370f324e10140ddf92146376b45f0cbd0dc89

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