Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c7c29178359bec…

MALICIOUS

PDF

75.7 KB Created: 2021-03-09 09:14:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 1ad79016e142ccd27ef4be27666de956 SHA-1: 7697995df998c14005b943f6c1d8c84f521f1af4 SHA-256: f8c7c29178359bec0308652968f6a78a22fcbad782e7e89a5ee791f5352fe283
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting and link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to 'penny stock' and 'wkhtmltopdf', indicating a potential lure for financial scams or exploit delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://golowaki.ru/strik?utm_term=how+to+find+penny+stock PDF link annotation
    • http://nopowajowopu.iblogger.org/jigabefolagitarozonewa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405687/normal_5fda774e7da06.pdfIn PDF document text
    • http://supesanav.iblogger.org/how_many_subject_tests_does_stanford_require.pdfIn PDF document text
    • http://idealicaitaly.site/honda_shadow_1100_aftermarket_partsnm8tf.pdfIn PDF document text
    • http://xititarosoki.iblogger.org/monsters_vs_aliens_president_song_sheet_music.pdfIn PDF document text
    • http://getezuderag.iblogger.org/12442072401.pdfIn PDF document text
    • http://keepmaxi.space/verbos_comparativos_en_ingles_lista2ou0r.pdfIn PDF document text
    • http://jipujitematane.iblogger.org/cuisinart_ice_cream_maker_at_walmart.pdfIn PDF document text
    • http://biomanua.website/jexivimumokisosefutynry7.pdfIn PDF document text
    • http://javofekuniti.22web.org/how_to_negotiate_to_buy_your_leased_car.pdfIn PDF document text
    • http://mimamiva.iblogger.org/kefuvoto.pdfIn PDF document text
    • http://mx50off.info/656736643364rch5.pdfIn PDF document text
    • http://aslixan.com/when_was_the_temple_in_jerusalem_destroyed_by_the_babylonianso404q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464055/normal_6045e339d5b7a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_165aeee893584647aebe8052e824f9de.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/69646736-8dea-4ea7-bb0f-2dca85fa1d05/gidotavokez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a80e93b-773c-4209-a012-3a658f74a700/7017517365.pdfIn PDF document text
    • http://tibibexubedumu.rf.gd/77450627882.pdfIn PDF document text
    • http://mosokuwovilo.epizy.com/zemowixugozazotu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f25df628-d6cd-4fdc-91ec-2c7b5f459ed6/bmw_e30_repair_manual.pdfIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_44bf80e858ce47eea064f1d3f93ac844.pdf?index=trueIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_e7ac1ff787f34a47b3090bac465ff9cc.pdf?index=trueIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_92012c9b3c374178b125a8d72afebc86.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3859d331-475e-44e7-bd6f-506064ec29d1/what_is_wendys_value_menu.pdfIn PDF document text
    • http://bujuxuvumelijet.epizy.com/vojoba.pdfIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_d87641426693488bb25c52849192b3ce.pdf?index=trueIn 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_off0000eafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFC 5032 bytes
SHA-256: 14694c38eb41ccc6255330d7ada31e83044581f02798218c07afae024d850f0a
font_01_sfnt_off0000fc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 10900 bytes
SHA-256: 9f885ce03bc30c7a0abcf9569fbf91d949eb6d6c2d9eafe34d125e50ea928694