Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7dcd26705231f11…

MALICIOUS

PDF

75.3 KB Created: 2021-04-07 18:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 281714567d3a99fca8bb1aa2c6048960 SHA-1: 2064393d593595b1f58c1f0923e773d8f91d580b SHA-256: b7dcd26705231f11d87750e77c6b0ab0d506e72e189427620b8056163eb5f48d
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and heuristic detections indicating it is a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to finding software serial numbers, which is a common lure for phishing attacks.

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://pelibifir.ru/strik?utm_term=where+to+find+adobe+acrobat+serial+number+in+registry PDF link annotation
    • http://appletopshop.ru/dobiripobejofibuvilotajifa58tg.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/KieZtgi/screen_time_app_android.pdfIn PDF document text
    • https://nizosanaradeke.weebly.com/uploads/1/3/4/8/134856136/8594780.pdfIn PDF document text
    • https://cdn.sqhk.co/wenewojufaj/Ljb0ibI/mope_io_space_games.pdfIn PDF document text
    • https://cdn.sqhk.co/juvanejejuwo/1T2gdjg/planet_fitness_login_app.pdfIn PDF document text
    • http://datinge.site/46089168175u17vj.pdfIn PDF document text
    • http://feyakast.online/orbit_water_timer_repair76p1j.pdfIn PDF document text
    • https://gamevuwi.weebly.com/uploads/1/3/4/5/134525912/8314740.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/hpqjf4g/xiragafifupe.pdfIn PDF document text
    • https://jonapofa.weebly.com/uploads/1/3/4/6/134699055/759258da.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://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_092815a0684a4150b4b78711e3f9d230.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/capacitor_ceramico_102_datasheet.pdfIn PDF document text
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_57ae7916f5704797838a81ae0c64ee46.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sizabo/kiliv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2ee62fd-ed79-463a-8e40-51623a41413e/57389720878.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/ludipadofeborisika.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/jnc_8_hypertension_guidelines_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85cfc318-33df-4843-acae-276cd67308ce/stihl_battery_trimmers_price.pdfIn PDF document text
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_748fff9a04c04b63b6eddc9c084cef66.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/17900626548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9acacb37-fbca-4f3e-9a24-9654a482dcb7/yoga_mudra_wikipedia.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_off0000dc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4A 5572 bytes
SHA-256: e7df10a41638b870c2349f34e1bb127aead8c4c5fca5e791eb1cd0e25c6791ce
font_01_sfnt_off0000ef19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 9984 bytes
SHA-256: 8a435975b8d8a48ca964f9abd8b4b46917949773e1d37e88486cf32a073ace61
font_02_sfnt_off00011150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11150 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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