Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4169788cd9ab252…

MALICIOUS

PDF

84.3 KB Created: 2021-03-06 16:21:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ccef89ab32e980fb24214ef896813f79 SHA-1: dff48d71d63316ebd5ca81c8f69a56ec3bac62dd SHA-256: a4169788cd9ab252a585095c8596378f8c1deb6005fab9f0e80b0f501f1f9359
184 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://dafemum.ru/aws?utm_term=how+much+school+to+be+a+dentist', is flagged as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to educational costs. The presence of multiple links and the ML classifier's high confidence score indicate a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/aws?utm_term=how+much+school+to+be+a+dentist In PDF document text
    • https://wanagewuzedu.weebly.com/uploads/1/3/1/3/131383352/legasunuleliz.pdfIn PDF document text
    • https://zaporori.weebly.com/uploads/1/3/4/1/134131460/fatipevetal-mofegakoniraki.pdfIn PDF document text
    • http://vemiwegar.iblogger.org/rixigunisukonawoxak.pdfIn PDF document text
    • http://potaberukogox.66ghz.com/12754848060.pdfIn PDF document text
    • https://wefidabewurar.weebly.com/uploads/1/3/1/1/131164485/pazotuwukamizofasibe.pdfIn PDF document text
    • https://rupasofo.weebly.com/uploads/1/3/4/8/134892789/tesadojowa.pdfIn PDF document text
    • http://kirazoki.22web.org/3105137342.pdfIn PDF document text
    • http://namunogetivij.iblogger.org/19655160393.pdfIn PDF document text
    • https://tulivugid.weebly.com/uploads/1/3/4/6/134607321/pusegupakejefuneli.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/jolituzoji/14478630800.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/18949916703.pdfIn PDF document text
    • http://fatigovonid.rf.gd/general_intelligence_questions_and_answers_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90064ea3-7d0a-42aa-a3d1-941e61553325/satokizusekafasaxotiteb.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/29883562746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/953d7522-79e3-4fe1-a273-722809b803b6/insinkerator_badger_500_power_cord.pdfIn PDF document text
    • http://sezipikoguzole.epizy.com/liability_release_form_template_free.pdfIn PDF document text
    • http://bolatufor.epizy.com/82743515601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b33c0484-9532-42b8-b7ad-d133e8af339b/pretty_little_liars_season_7_episode_18.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cf43766-3d93-4a88-9fb1-7d39c5d44d31/25550555633.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4136b58f-46bd-453d-a727-0f3c83f39992/29891299852.pdfIn PDF document text
    • http://wifiwaxaranuf.epizy.com/zerom.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/87387116269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cce79f9b-5e56-4a02-9699-b2ffeec2561f/riboleviporuwonagi.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_off00010cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD6 5276 bytes
SHA-256: 0389497bcb1a8f0d379272992021a78bf26450f3d10785657fdb0f86253ac0e6
font_01_sfnt_off00011eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAF 10880 bytes
SHA-256: 511a75cd3e056eee371a1abeb8f9f1b7d0c03ad7184d3d836a6c72dbdf5afd6d