Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a2bb794d1c9791…

MALICIOUS

PDF

76.3 KB Created: 2021-05-21 15:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cda5f2d08ea80840940f45d8219e77b SHA-1: 47b9a01f023869557b3de811170aa76f7e929da9 SHA-256: d6a2bb794d1c9791b8f495ea4dc64446d48c5bf74fa79bf10c3bd531b20161b2
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a callback phishing lure. The embedded URL, while marked as unknown reputation, likely serves as a component of the phishing infrastructure. The document body, though heavily obfuscated, contains text related to syncing a Verizon Fios remote, suggesting a pretext for the scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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+sync+my+verizon+fios+remote+with+my+tv
    • https://static.s123-cdn-static.com/uploads/4379363/normal_5fc79a226ae1a.pdf
    • https://cdn-cms.f-static.net/uploads/4487194/normal_6028020eced78.pdf
    • https://static.s123-cdn-static.com/uploads/4476751/normal_5fdf8876e309d.pdf
    • https://cdn-cms.f-static.net/uploads/4493888/normal_60199e3df39e2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bejenosugede/xukukuxipamo.pdf
    • https://s3.amazonaws.com/fibesezati/22331753390.pdf
    • https://uploads.strikinglycdn.com/files/ea497d6c-e327-45d4-9f16-36df500bb07d/how_to_critique_a_stage_play_evolve.pdf
    • https://uploads.strikinglycdn.com/files/954f20aa-6c74-4dec-a684-e224eff6616e/kezakenubibug.pdf
    • https://uploads.strikinglycdn.com/files/ae909fd1-6d04-4797-9671-0140a9db452a/iron_man_glove_template.pdf
    • https://s3.amazonaws.com/bodajaku/6797510168.pdf
    • https://s3.amazonaws.com/zibenoroduzuw/67856954493.pdf
    • https://s3.amazonaws.com/nisoxow/euphonium_sheet_music.pdf
    • https://s3.amazonaws.com/pevarijidasalop/bexeluxugumov.pdf
    • https://uploads.strikinglycdn.com/files/39d1aaf9-227c-40e3-977e-9a018f5b8715/92606173028.pdf
    • https://uploads.strikinglycdn.com/files/82f45192-a3b9-4e94-b12c-16b7698a4739/bovusabul.pdf
    • https://uploads.strikinglycdn.com/files/8a0678fb-10cc-4bc7-8a67-1e6cb7388dfe/gonokibetevisulelada.pdf
    • https://uploads.strikinglycdn.com/files/fe1d288f-1deb-4c64-bde0-95ce3c2ede24/99983278271.pdf
    • https://uploads.strikinglycdn.com/files/a8e28eb5-2b06-4640-970c-545899f5b30b/gegopalifatetiwufutoriba.pdf
    • https://uploads.strikinglycdn.com/files/b7ccfc57-58f2-4f17-9181-8beded847c70/fantastic_mr_fox_plot_synopsis.pdf
    • https://uploads.strikinglycdn.com/files/c585cb83-e6f5-4f47-9918-3019f6f85248/wosujujeguzo.pdf
    • https://uploads.strikinglycdn.com/files/2881e869-6c5b-4548-91d2-a20b65be6e06/pozakagopo.pdf
    • https://uploads.strikinglycdn.com/files/c014b79b-1d08-47df-8336-e77fa75a1747/14135654561.pdf
    • https://uploads.strikinglycdn.com/files/adb07d9a-ae47-41c9-ac59-e09f67b5afaa/cuanto_son_un_metro_en_centimetros.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf4.bin
f92c96a7ad1a1ed2c794ceef68dde25058fefeb1ef7ff70eae9c51181a851757
pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 5144 bytes
font_01_sfnt_off0000fe70.bin
f176f18423382e928631ec9b6c6c898065d8f0253f7e63b6b3f99d7aeb55b7bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE70 10884 bytes