Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b10cb816448fde…

MALICIOUS

PDF

83.7 KB Created: 2021-03-10 14:04:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cacfbe3c30e0d91692164210ab605ef SHA-1: 78a63aca9f2d89ec405005714c054057df9c9a1d SHA-256: 76b10cb816448fde7c47be39cbf68475f6a048d17c8724d9fdd33d8528d83d40
192 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The embedded URLs and the PDF structure suggest an attempt to lure users to external sites, likely for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://yafferge.ru/strik?utm_term=kenmore+300+water+softener+manual
    • http://kufafukedexepix.mygamesonline.org/sanowozapoxoweloduxafe.pdf
    • http://nokasosozigof.mypressonline.com/what_is_the_concept_of_landscape_planning.pdf
    • https://static.s123-cdn-static.com/uploads/4444356/normal_5ff53720ccb2e.pdf
    • https://cdn-cms.f-static.net/uploads/4423189/normal_601a06c999bcb.pdf
    • http://gosunenibunale.getenjoyment.net/reliability_theory.pdf
    • https://static.s123-cdn-static.com/uploads/4485935/normal_5ff5b3e8ce4eb.pdf
    • https://cdn-cms.f-static.net/uploads/4416501/normal_601d9f7e6c0b3.pdf
    • https://cdn-cms.f-static.net/uploads/4489601/normal_60404f5a12591.pdf
    • https://gewivobom.weebly.com/uploads/1/3/4/6/134643535/3fdf5d6.pdf
    • https://static.s123-cdn-static.com/uploads/4447096/normal_5fe01f0adf99b.pdf
    • https://fokepepepaxa.weebly.com/uploads/1/3/1/4/131483327/nixadagax.pdf
    • https://jitivafume.weebly.com/uploads/1/3/0/9/130969372/kobesa_labagege_malimilajo.pdf
    • http://bopolubolef.mywebcommunity.org/gqf_sportsman_1502_incubator.pdf
    • https://cdn-cms.f-static.net/uploads/4463554/normal_6030165ebc348.pdf
    • https://cdn-cms.f-static.net/uploads/4367646/normal_6046b11720875.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_166da01949e6446c9f4961be9ab69bfc.pdf?index=true
    • http://fazovalekotevo.onlinewebshop.net/mechanism_of_action_of_general_anesthetics.pdf
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_5099c56509a8414d8514ab3d908485ed.pdf?index=true
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_2ca305ac70444db0b62616d00fc6b6fe.pdf?index=true
    • http://jokubamobivavum.onlinewebshop.net/49864147763.pdf
    • http://lumosaneja.onlinewebshop.net/best_2d_animation_software_for_beginners_free.pdf
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_359d3b10a0644082be4f47ebb1822b8d.pdf?index=true
    • http://jemileti.atwebpages.com/how_many_red_jacks_are_in_a_deck_of_52_cards.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fda7.bin
8ce82c0043444bf5d8ed2aeadf6ceb9a982fccfd399e9fe7913cfc3d4c77c2ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA7 5112 bytes
font_01_sfnt_off00010f01.bin
aab78b8e5a36901074fd8d999c26717cf3cc01a7b5cbcc25e1d0b2d959c6c2ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F01 10600 bytes
font_02_sfnt_off00013352.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13352 4324 bytes