Malicious PDF — malware analysis report

Static analysis result for SHA-256 85112a22af7e069f…

MALICIOUS

PDF

84.4 KB Created: 2021-05-28 08:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4172e8d7bade7832614c483d8fc46441 SHA-1: 9808e416f427418755bf31504bf319c24345793d SHA-256: 85112a22af7e069f252e2ff5e782655e3e9d661c8567ffc298d95d8ce5576198
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, contains text related to technical issues ('Callers can't hear me on my android'), suggesting a pretext for the malicious link. No scripts were extracted, but the presence of a malicious URI is a strong indicator of a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/strik?utm_term=callers+can%2527t+hear+me+on+my+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448556/normal_605a24975249f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505159/normal_6052f0cd011a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469106/normal_5fd92a7e003eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450889/normal_601953226e433.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408475/normal_601a077e90203.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464709/normal_6038ef2d7a905.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483602/normal_5fc7dd2e025c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501991/normal_5fe9d0fb61cab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406455/normal_604924a1a81ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427094/normal_6015e6987522f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367268/normal_60466401324ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381752/normal_5fcf86394ecb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475571/normal_60273cc075189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496592/normal_60214deb0945a.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/c7a77b02-25d9-4879-8afc-bc39a4224330/deropapugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/683a97da-f004-4339-8b4b-0cb1374533d3/tewufajasezakagafotavu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b40a417-5b7e-4757-8ddd-4699787be793/what_is_irish_traditional_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc8c81e-bbb1-47c9-997f-1783a7f315ae/how_to_set_analog_time_on_g_shock_5522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e2d4965-0eb6-4c39-bc74-ed2344c1d3cc/dell_precision_490_bios_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22724f17-195f-4a1e-9ec4-22a31c8ead5d/dalujo.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_off00010b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B21 5220 bytes
SHA-256: d81ad58ed5495bb42ff27a7263b3857bd0cdef2bec541e3d2577b1f31f0950dd
font_01_sfnt_off00011cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBC 11528 bytes
SHA-256: 15c888bf4434fc8f5ea6cd4db4de95e268b30eb41282b29d556fc709044ca4d0

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