Malicious PDF — malware analysis report

Static analysis result for SHA-256 848a79c29ff2e288…

MALICIOUS

PDF

81.0 KB Created: 2021-03-24 18:27:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 56758a360b818ec955b37559007b7de6 SHA-1: d33c1888864679368d31157c55fd610c99945e50 SHA-256: 848a79c29ff2e2881fd8e2b4c8800f2a6726a7f1e0206aab31ed6c2578d0610d
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicative of a link farm or phishing operation. ClamAV and ML classifiers identified the file as malicious, specifically flagging it as a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document's primary purpose is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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=cya+basketball+schedule PDF link annotation
    • http://monubaz.iblogger.org/commodities_income_guidelines.pdfIn PDF document text
    • https://forerijekakifur.weebly.com/uploads/1/3/5/4/135401119/1f1005ee.pdfIn PDF document text
    • https://tejenopaje.weebly.com/uploads/1/3/1/1/131164027/8016894.pdfIn PDF document text
    • http://vemasujananexu.22web.org/80048684947.pdfIn PDF document text
    • http://dutalamujuso.66ghz.com/diablo_3_switch_farming_guide.pdfIn PDF document text
    • https://lazarapo.weebly.com/uploads/1/3/4/5/134528324/pujidaxu.pdfIn PDF document text
    • https://fepobiwebefu.weebly.com/uploads/1/3/4/5/134592484/jagutiradim_tuvok_kedegeraxasimom_jagofunoparawa.pdfIn PDF document text
    • https://muvekova.weebly.com/uploads/1/3/5/3/135394778/f55f78f806a.pdfIn PDF document text
    • https://junerokiwoji.weebly.com/uploads/1/3/0/7/130775834/d38533c0702e1a4.pdfIn PDF document text
    • https://fodolazaso.weebly.com/uploads/1/3/4/8/134891373/rulato.pdfIn PDF document text
    • https://zizeximafebofiz.weebly.com/uploads/1/3/4/3/134369397/rumotorufutedamijewe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://molamizaxe.epizy.com/dedikebe.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/android_tv_malaysia_app.pdfIn PDF document text
    • http://magelul.epizy.com/wedding_budget_template_numbers.pdfIn PDF document text
    • http://gonuwufif.epizy.com/turkish_airlines_fleet_information.pdfIn PDF document text
    • http://tevufojetuxovud.rf.gd/spice_and_wolf_manga_last_chapter.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/46528760092.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/udemy_er_for_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/87012945268.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_3fba9b2139404cf0923d499bacf0ebc3.pdf?index=trueIn PDF document text
    • http://daluzijirajof.rf.gd/traducir_archivo_de_aleman_a_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/zlib1._dll_windows_7_32_bit.pdfIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_a235b8dcbe9c4e8dab5b3a4c7e7aa180.pdf?index=trueIn PDF document text
    • https://6346cca1-8be9-442e-91e0-e35201572fa6.filesusr.com/ugd/a8c077_00cec0f2218c4d62baf75ab1a3fb3fad.pdf?index=trueIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_1c2aa74fbdb042fd8f88ee7e7cd8d10b.pdf?index=trueIn PDF document text
    • http://sumafalonedap.rf.gd/o_alienista_caleb_carr_gratis.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_off0000fd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD92 5144 bytes
SHA-256: 23ff605c86351e2c2acdd893a77ed730aeb7d7ecb03fb06095d75553dee34b31
font_01_sfnt_off00010f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F11 11632 bytes
SHA-256: 363b31499a4eef402628ba4f5fe23ca85a83d67197c4bd06690ca1ce5f3cc31b