Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f69d3600c680555…

MALICIOUS

PDF

80.6 KB Created: 2021-04-20 16:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: aa45f4ade30a6ecf3e47d4427003175a SHA-1: c651363d95b26bf8f16b7d83e4d45d0f57150ec9 SHA-256: 3f69d3600c680555f908bcacdbb09e7a7bba3ac6330030cb07831e73815579ec
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, with one directly mimicking a search result for a common query ('why is my samsung charging so slowly') leading to a suspicious domain. The presence of multiple disposable hosting domains and link farm characteristics further indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=why+is+my+samsung+charging+so+slowly PDF link annotation
    • http://fejiximodanu.mygamesonline.org/20672761967.pdfIn PDF document text
    • http://thrivewebs.com/75925363422vfpg5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404133/normal_603eaa4e7ec26.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/the_hunters_hunted_iim7dex.pdfIn PDF document text
    • http://varakeno.iblogger.org/50880119131.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://dimanowogodado.22web.org/magabogukilafejarejalowek.pdfIn PDF document text
    • http://negozio50sconto.info/633177825037vn90.pdfIn PDF document text
    • http://xonitaj.mywebcommunity.org/how_to_cook_in_a_combi_microwave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374848/normal_5fdc2de972055.pdfIn PDF document text
    • http://busapibasin.mypressonline.com/protocols_for_in_vitro_propagation_of_ornamental_plants.pdfIn PDF document text
    • http://gufutaca3.xyz/sopukevapujimogjb3oi.pdfIn PDF document text
    • http://wimesuzajomos.mypressonline.com/kabamadifaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425492/normal_604f6626e626d.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
    • http://kuxemozoxabonag.onlinewebshop.net/woradakilifape.pdfIn PDF document text
    • http://gefelabofine.rf.gd/tedobex.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/55529738112.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/tapapakumapo.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/zuxefaturosotupuzefa.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/praise_and_worship_powerpoint_backgrounds_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/tisaniwuselot.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_off0000ef01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 5104 bytes
SHA-256: ec455f882fd47f706361b1fe3d6b97439b0c38727aa1fc1750f103eeecbdeff3
font_01_sfnt_off00010033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 11340 bytes
SHA-256: bac0126cd94412700af180649a158ae7590ca5aafaaa2f41c57ad38a0cad1527
font_02_sfnt_off000126d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D2 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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