Malicious PDF — malware analysis report

Static analysis result for SHA-256 1699ef3dbe59d6c1…

MALICIOUS

PDF

100.9 KB Created: 2021-03-01 13:03:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 643df15e46dfc362ccb56606a7d8196d SHA-1: 2093ca213206cf901762122c7d4ff2dbff935ff8 SHA-256: 1699ef3dbe59d6c1bd901de9f5eaec904e4f8e22557475ffdc86bad34ff806d5
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 trojan. It contains numerous embedded URLs pointing to external websites, many hosted on disposable domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, appears to be a lure related to 'Korean adverbs list pdf', intended to trick users into clicking the malicious links.

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://bologen.ru/award?keyword=korean+adverbs+list+pdf PDF link annotation
    • https://sufepupebesi.weebly.com/uploads/1/3/4/6/134636280/mamupilus.pdfIn PDF document text
    • http://netekepipavosis.sportsontheweb.net/pujiburuvujozowama.pdfIn PDF document text
    • http://siviveko.getenjoyment.net/what_are_parallel_structures_in_writing.pdfIn PDF document text
    • http://zomolejefej.mywebcommunity.org/midisewexetit.pdfIn PDF document text
    • https://vixevugipun.weebly.com/uploads/1/3/5/3/135327752/6876552.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387920/normal_6014616853666.pdfIn PDF document text
    • https://cdn.sqhk.co/piwewupovo/jf4gf0A/tafheem_ul-_quran_in_english._free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tuminageka/isjbjc7/43263794863.pdfIn PDF document text
    • http://xitodefigatefuj.medianewsonline.com/how_to_scan_on_hp_deskjet_2512.pdfIn PDF document text
    • https://ronitodusod.weebly.com/uploads/1/3/1/3/131380212/mejawuduzewu_dulelop_pabagesipenuva_pevinupisakev.pdfIn PDF document text
    • https://nufapapezo.weebly.com/uploads/1/3/0/9/130969462/3983e88402b0001.pdfIn PDF document text
    • https://cdn.sqhk.co/gosukutusu/Nf3SieU/sadofabig.pdfIn PDF document text
    • http://segovozeperi.22web.org/blodgett_convection_oven_troubleshooting.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/dan_brown_inferno_book_vs_movie.pdfIn PDF document text
    • https://kuvixirizu.weebly.com/uploads/1/3/0/7/130739951/zisefoxavosaxig.pdfIn PDF document text
    • https://cdn.sqhk.co/fisoxinizo/hh4hggc/tales_rush_mod_apk_1._4._0.pdfIn PDF document text
    • http://figojusu.iblogger.org/japudumomonasikaxaredas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jofesowevelen.epizy.com/zabigude.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 29360 bytes
SHA-256: caf01fbf28cb214d158bbc4e17f5eab4e5c2d15ce369e2fdbda4694a7266d353
font_01_sfnt_off00014856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14856 5204 bytes
SHA-256: f306479e47ab730bb88da4d8f392f4cd628e10a6f491aaf7ed3486f3952400bb
font_02_sfnt_off00015a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A1B 13912 bytes
SHA-256: 7b48ee401d50769e226b0cc32b13967e9bf2cb8f49f1ccc2a55fad6547ab1072

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