Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc53a895aa1ae3e3…

MALICIOUS

PDF

108.0 KB Created: 2021-03-06 21:04:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 52d3f2b1b7579e94d6abe6de092fc50e SHA-1: 31ae405f59328265787afb488e2cacb665398b66 SHA-256: bc53a895aa1ae3e36072646abf16e213c0006dcb65a0df65376f959fbaec32ad
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 0.9994

Heuristics 6

  • 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 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://soxebez.ru/wix?keyword=manual+flash+calculator+pro+apk PDF link annotation
    • https://kusafulidofet.weebly.com/uploads/1/3/4/0/134017607/durisodugexaf_xeledakezodi_tanixuguluvijik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382952/normal_5fd27b3d3cb09.pdfIn PDF document text
    • https://zitejapaj.weebly.com/uploads/1/3/1/8/131872087/miropikevikujam.pdfIn PDF document text
    • https://cdn.sqhk.co/pufuxogife/QgcTihm/femokimifevojatepiwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403816/normal_603d1371ee2d9.pdfIn PDF document text
    • https://luletifolavok.weebly.com/uploads/1/3/4/3/134369244/jukat_tizogagarad_jomuvonezen_fimalikavisijar.pdfIn PDF document text
    • https://cdn.sqhk.co/tobajizil/ieTjigg/15074157235.pdfIn PDF document text
    • https://vuxomikegivu.weebly.com/uploads/1/3/1/4/131453843/40799e6dcb.pdfIn PDF document text
    • https://cdn.sqhk.co/jujejorule/1Xhfe5O/samsung_galaxy_core_prime_phone_cases.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494147/normal_5fce4bfdf2a49.pdfIn PDF document text
    • https://xufizuwerab.weebly.com/uploads/1/3/0/7/130738786/7338035.pdfIn PDF document text
    • http://fumuroruzej.medianewsonline.com/vakar.pdfIn PDF document text
    • https://cdn.sqhk.co/mivadunoxo/BOkshjB/90131727067.pdfIn PDF document text
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/woferupezuno.pdfIn PDF document text
    • https://pagugedupe.weebly.com/uploads/1/3/4/2/134266786/rilosok_rukutegupopije.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419827/normal_6039f94f67f3f.pdfIn PDF document text
    • https://kewegiru.weebly.com/uploads/1/3/1/4/131438086/c9ebd95c.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/radubozufiwo/nimorodupotubojasulanul.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/how_to_make_zero_clearance_throat_plate_inserts_for_table_saws.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/chain_rule_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/loloj.pdfIn PDF document text
    • http://mubodadekutaxim.atwebpages.com/didadi.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/love_breakup_zindagi_songs_ming.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_off00015fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FC4 5172 bytes
SHA-256: 0a82b672a1370ef7c2c9d07fab252caf2fb721149e3f375048c0b41f1a07eb14
font_01_sfnt_off00017165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17165 15540 bytes
SHA-256: cd093b91c0c1e8701a867d6a2482c83d1cc7267910ab9cbaf49d392e1be58607

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