Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa67846ce00913f5…

MALICIOUS

PDF

83.6 KB Created: 2021-05-11 01:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 91c804035bb4d6e5e635918cfe20bae9 SHA-1: c69f37f7f0f877a68dcae5b814e2caf663db2553 SHA-256: aa67846ce00913f534bba624596c9c9ed3697bedabf82df5cc4d9a5b9157db20
226 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to disposable hosting, and is designed to harvest credentials or abuse multi-factor authentication. The primary malicious URL identified is https://botokaw.ru/strik?utm_term=how+to+reset+voicemail+password+on+nec+dt300.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://botokaw.ru/strik?utm_term=how+to+reset+voicemail+password+on+nec+dt300 PDF link annotation
    • https://cdn.sqhk.co/zolilobup/jjfgjig/rotator_cuff_band_exercises.pdfIn PDF document text
    • https://moxuludo.weebly.com/uploads/1/3/4/7/134759924/tususuxi.pdfIn PDF document text
    • https://surudebed.weebly.com/uploads/1/3/4/5/134513173/8488135ee2.pdfIn PDF document text
    • https://zejebamusij.weebly.com/uploads/1/3/2/3/132302936/6012376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482636/normal_606dd7681bd89.pdfIn PDF document text
    • https://cdn.sqhk.co/junikesiza/jdvigih/every_outfit_in_assassin_s_creed_origins.pdfIn PDF document text
    • https://pevolevu.weebly.com/uploads/1/3/1/6/131606362/wuvaxi.pdfIn PDF document text
    • https://lejufonibo.weebly.com/uploads/1/3/4/4/134470114/jaruduto-geniri-sadipamotat-busoramudij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454665/normal_604b1b79bb4a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450249/normal_60584dcfd7932.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/nhfhelz/makulujadigirenafazita.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/858afb4f-7ad7-4c13-b8ad-fc1662b09e51/jenuwuwefaretoviwamo.pdfIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_8b29e60dfa294153969033c51e18059e.pdf?index=trueIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_e6f6cf4e3bd945de9145937b4d04df9e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/806829a3-2abc-4d58-8c04-cc4e6a31bac1/52976625173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d241e495-a75c-4e74-8b53-227542acb14b/82285333343.pdfIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_d8945d5499b04d6baf46db0a1206b5bd.pdf?index=trueIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_efcea88b2fbe492a86d8703fea061a89.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/361e71cd-b2f8-4072-ac2d-e81a907e264d/wobuwudururagaveg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0262dc57-a6a7-41c9-be41-a0ba7391563a/baofeng_uv-5r_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f1bd358-b7a9-47ad-9c2c-310c484fde93/freightliner_recreational_vehicle_chassis_workshop_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15ac6aca-7878-4567-ad59-9a6144a0c198/what_foods_to_eat_on_advocare_10_day_cleanse.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_off00010614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10614 5640 bytes
SHA-256: a907e32e1a8f5c5bf5047ed3fd6571830928cf16a6d543368e44210a8dd6f6bd
font_01_sfnt_off00011939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11939 11580 bytes
SHA-256: 541798b45aff18185bf1fbba9013069659f36a36f75f1bf521f5058ace11dec7