Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6480a1acb84ebe…

MALICIOUS

PDF

78.4 KB Created: 2021-02-14 00:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a40699370cff7d4480f75944a247b90f SHA-1: 87c131fb6ea56849ce646bb900c5e20deb1cf442 SHA-256: dc6480a1acb84ebe1a03f85dc6610db0e61c2a62be653a49d0ac15e982e6a980
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to a "Thor the dark world mod apk highly compressed" download. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly indicates a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution attempt.

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.
  • 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/wix?keyword=thor+the+dark+world+mod+apk+highly+compressed PDF link annotation
    • https://jexabuwojese.weebly.com/uploads/1/3/1/3/131384148/ranosejepad.pdfIn PDF document text
    • https://cdn.sqhk.co/vopokemib/mqgh7oB/35583787761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446507/normal_60222573877f7.pdfIn PDF document text
    • https://cdn.sqhk.co/pemenixa/2bEpjcL/events_in_atlanta_today_family.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410206/normal_5ff8aa977cf2b.pdfIn PDF document text
    • https://cdn.sqhk.co/fukafodifi/jeBBifN/buwuzufixanasupivimifino.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/JON88hc/gaming_wallpapers_for_pc_1600x900.pdfIn PDF document text
    • http://like-store.site/56817277591l1i0z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424953/normal_6003b93352d68.pdfIn PDF document text
    • https://doxuginuf.weebly.com/uploads/1/3/5/3/135346615/f32dd.pdfIn PDF document text
    • https://tikefukexizuse.weebly.com/uploads/1/3/4/8/134879623/rajibedewupopapus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449392/normal_5feb1aff5964f.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxaguzifep/jhdgmgg/lamogutuxubebujix.pdfIn PDF document text
    • https://gaxasexafarud.weebly.com/uploads/1/3/4/5/134590452/5f525bd3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388160/normal_5ff4d5f1e1d70.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/dorulusof/interim_financial_reporting_ind_as_format.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/indonesian_to_english_dictionary_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/42376889646.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/79641069126.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE56 5692 bytes
SHA-256: 0dcd288a53db6e89d878993d590a5bf86f10980d2ac4de728bb9d151c40712de
font_01_sfnt_off0000f1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 10736 bytes
SHA-256: 8482b81ee179a79ed1bc6c7b31c28bb948b4d92a7284c79ec56ed093b8d24ee1
font_02_sfnt_off000116b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B4 16288 bytes
SHA-256: 9524a6132835cefbefd259eea6bea75efe621f4b1dd9a0ad0985cd65d94af726