Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5823f4fae21bca…

MALICIOUS

PDF

74.0 KB Created: 2021-05-24 20:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71cf4a3e79f857c62e2f24470cc5add7 SHA-1: 7b76e9e4c38222d43534f7ee2fba3d8582f9451a SHA-256: 8c5823f4fae21bcafad878569bd01dbc08b25757c083bfa9e734621c507fc11c
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URL that, when clicked, leads to a suspicious domain, likely intended to deliver a malicious payload or phish for credentials. The document body, though heavily obfuscated, appears to be a lure related to a search query.

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://zajinet.ru/strik?utm_term=best+linear+algebra+book+for+data+science
    • https://cdn-cms.f-static.net/uploads/4487413/normal_60392016a7a2d.pdf
    • https://senabexe.weebly.com/uploads/1/3/4/2/134265557/df08f3.pdf
    • https://static.s123-cdn-static.com/uploads/4417527/normal_60050d2e809b1.pdf
    • https://kaxemesotom.weebly.com/uploads/1/3/4/7/134732336/pebedobopilax.pdf
    • https://genifefesabido.weebly.com/uploads/1/3/3/9/133999330/9ad3adf2aafa7a.pdf
    • https://cdn-cms.f-static.net/uploads/4453888/normal_5fe6b070330a1.pdf
    • https://kipokemob.weebly.com/uploads/1/3/0/7/130738996/7a1b491a4a2beb4.pdf
    • https://rifituxajigibik.weebly.com/uploads/1/3/4/5/134519767/gobenomedovi-rudowonasi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rebomedug/workflow_template_microsoft_word.pdf
    • https://s3.amazonaws.com/wejuvono/citizen_quartz_gn-4w-s_price.pdf
    • https://s3.amazonaws.com/liguwubore/what_is_a_toolbox_talks_for_construction.pdf
    • https://uploads.strikinglycdn.com/files/9485f7c5-b9b0-4ceb-a389-6ddf0d5eb8be/96515415842.pdf
    • https://uploads.strikinglycdn.com/files/792e458e-ff97-4cfe-b277-8095c11e4c5c/vakujolisanul.pdf
    • https://s3.amazonaws.com/rekorewexidiwo/bhare_naina_song_mp4.pdf
    • https://s3.amazonaws.com/wetevali/47506514096.pdf
    • https://uploads.strikinglycdn.com/files/405f1652-7373-4820-ac50-3389fa56dfc8/93084735002.pdf
    • https://s3.amazonaws.com/netinuwa/us_geography_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/ed73aecb-d473-433c-9432-805e345f31df/xetiji.pdf
    • https://s3.amazonaws.com/lewuli/ajanta_caves_images.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_off0000e2e6.bin
300a17f01f7ecae5a1029db1b9bed18aa76ea22de9e257613a899309e056b32d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E6 5444 bytes
font_01_sfnt_off0000f57d.bin
d9a8e23b59e9b204e1d7c4805a073bc0da032476ccc77217ddb73cd098ccda54
pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 10752 bytes