Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa6a98d46a00427…

MALICIOUS

PDF

85.9 KB Created: 2021-02-27 15:46:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 3d3be5b1e4aa9b88c9c4344ce309ed74 SHA-1: e24dc23799a86be42cbd9044ce281edb88090542 SHA-256: efa6a98d46a00427e13fe4c215e62424d354e17e9af032b3cdabdc10c2022596
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://xezojetit.ru/strik?utm_term=ventajas+y+desventajas+de+los+medios+de+comunicacion+social+en+el+salvador PDF link annotation
    • https://guxojifupu.weebly.com/uploads/1/3/1/4/131438233/lorur-xedesazutozuge-xapeguvetemot.pdfIn PDF document text
    • https://cdn.sqhk.co/nizolurinidi/iugigcd/wix_filters_logo.pdfIn PDF document text
    • http://milanomoda-italy.website/what_is_an_example_of_negative_devianceisqe1.pdfIn PDF document text
    • https://cdn.sqhk.co/butemobe/jidjage/dungeon_defenders_special_delivery.pdfIn PDF document text
    • https://vijizonumek.weebly.com/uploads/1/3/6/0/136034009/xosidawufejuvit.pdfIn PDF document text
    • https://torufiwatus.weebly.com/uploads/1/3/5/3/135312416/turiwizu-risegolepivem-fabuvigafasegiz.pdfIn PDF document text
    • https://fonekukiko.weebly.com/uploads/1/3/5/3/135393218/jamid_femosuvipawikep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dopovis.myartsonline.com/nemani.pdfIn PDF document text
    • http://rawuvotatu.rf.gd/gali_chirugali_dj_song_wapwon_live.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/aaes_parathyroidectomy_guidelines.pdfIn PDF document text
    • http://medexode.atwebpages.com/the_bear_faulkner_review.pdfIn PDF document text
    • http://fovawipemezipu.myartsonline.com/85221182009.pdfIn PDF document text
    • http://jaxages.epizy.com/32325619829.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/c_a_c_ka_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/57668064377.pdfIn PDF document text
    • http://mukofusakox.rf.gd/34088812051.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/fimelewe.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/vagebomejejibulonuwa.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF187 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 5168 bytes
SHA-256: ff9bb4662c8935a3b52976d9920b6b2e36f1ba54e4012b85a178d38dbc23e629
font_02_sfnt_off000113fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FA 11264 bytes
SHA-256: c120f9f9a5b7e6a41be80b78886788ee2cb7298f43982572913e8c2ab37e9495
font_03_sfnt_off00013885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13885 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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