Malicious PDF — malware analysis report

Static analysis result for SHA-256 31579c5f81c657e8…

MALICIOUS

PDF

76.5 KB Created: 2021-03-19 21:09:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 994f560e83f668f570de6ba3d72ac7c1 SHA-1: b04df426173eeb9cc334bb26b987fab7de55f10c SHA-256: 31579c5f81c657e89f2bd2d5bc612a780093f27ab7e45cbaee781d34bfe0e1ee
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are used to redirect users to potentially malicious sites, which is a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=what+is+quartz+heater PDF link annotation
    • http://techanomic.com/1423059258wxepx.pdfIn PDF document text
    • http://creditactive.info/zosazazitivegezajubewela4meqm.pdfIn PDF document text
    • https://fujovufizopi.weebly.com/uploads/1/3/2/7/132710671/6599866.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/jatogi_jimuvir_sezovilidovuga_modosunogat.pdfIn PDF document text
    • http://copyrightmediahelp.com/the_road_movie_online_watchwq68d.pdfIn PDF document text
    • http://hiziryigit.online/how_to_cook_a_pernil_puerto_rican_stylegmvzz.pdfIn PDF document text
    • http://prizinsta.info/99887936365xsc4m.pdfIn PDF document text
    • http://brandframeb.com/35125333532uw4ee.pdfIn PDF document text
    • http://yesnutural.space/wiwokanifeloposawizochvcj.pdfIn PDF document text
    • http://lnstagram-verifedbadge.com/beravafonegunutijovabatvja1a.pdfIn PDF document text
    • http://antonio-ita.space/fools_rush_in_falling_in_love_with_youp76hn.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
    • https://uploads.strikinglycdn.com/files/b2a489df-64c4-4341-8af1-484b136e0c17/mean_median_mode_range_problems_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff38635a-bd25-4a02-ba78-1991c068fb30/what_is_a_solo_parent_leave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de0e2a0b-96aa-4165-a3e5-d0f6952c7ed4/datuzizujabotunaluzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/519f91f4-2c76-4827-8427-851647ed5de0/zamuraxodojifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87c4b11b-62ae-4843-83ff-084579d1f7a2/37549594414.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE349 4596 bytes
SHA-256: 72440730363f34f76868c49978f987d51a2c058f96a0503ac764270b7121d514
font_01_sfnt_off0000f30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30A 10764 bytes
SHA-256: 7788ecff153ed3baf3441fe70aa7958365379905bcf854a3ff247200ed7614c4
font_02_sfnt_off000117c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C6 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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