Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58bc584cee1143c…

MALICIOUS

PDF

75.5 KB Created: 2021-03-20 20:49:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc0f3e68af566c40d3dcc5d57832451f SHA-1: 5e2ed5504f9b22f232d33517df1b6158521669de SHA-256: a58bc584cee1143c263752d7ea3052b1dfa54c4a6f7dce42f94808767c17dcf4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains an embedded URI pointing to 'jumiwimov.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to Android terminal emulators, aiming to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/wix?keyword=android+terminal+emulator+apk+xda
    • https://cdn-cms.f-static.net/uploads/4387589/normal_601604727ca6f.pdf
    • https://cdn-cms.f-static.net/uploads/4467318/normal_601b359b8e0db.pdf
    • https://wamukefak.weebly.com/uploads/1/3/5/3/135324497/8193975.pdf
    • https://cdn-cms.f-static.net/uploads/4427509/normal_602d6d6f5712a.pdf
    • https://cdn.sqhk.co/vedimurami/Zxhdjje/aagadu_audio_songs_com.pdf
    • https://revixapega.weebly.com/uploads/1/3/4/6/134619396/lutetix_sijafavugetejo_fipavaje_kusigozusujuze.pdf
    • https://somalinoduka.weebly.com/uploads/1/3/5/3/135392385/6a173.pdf
    • https://cdn.sqhk.co/zimamoko/gjfja8s/fefamedenokamegipejero.pdf
    • https://cdn.sqhk.co/tajiwikiter/dYgcicg/money_maker_make_money_online_with_mobile.pdf
    • https://cdn.sqhk.co/sadetujadufi/ayepGhh/t_mobile_digits_login_issues.pdf
    • https://bolowotusupiwam.weebly.com/uploads/1/3/5/3/135300352/befa672.pdf
    • https://cdn-cms.f-static.net/uploads/4455670/normal_5fd1e78e891db.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b4ec7567-bd84-48f7-a263-5ddb9a7c3fa1/replace_ntuser.dat_windows_10.pdf
    • https://uploads.strikinglycdn.com/files/7b58642f-9cca-4b17-923f-aff0b7fd1a1f/black_and_decker_lids_off_parts.pdf
    • https://uploads.strikinglycdn.com/files/5edc1ce4-557b-448c-8a7b-cfcf7153ca67/niwutekibuwuxaxesawosak.pdf
    • https://s3.amazonaws.com/biwuwukesazef/pikon.pdf
    • https://s3.amazonaws.com/mejados/les_miserables_movie_soundtrack_do_you_hear.pdf
    • https://uploads.strikinglycdn.com/files/f63bb089-c781-4729-89a6-77db21c559bc/crystallizing_public_opinion_bernays.pdf
    • https://uploads.strikinglycdn.com/files/50654151-702f-466a-a9cc-39244ba90c78/how_to_write_a_conclusion_for_a_university_essay.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_off0000e82a.bin
a345d7d1f94aeb11904e83e7d04d7b623dcd07a81445d823d5852c2dd71774d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE82A 5048 bytes
font_01_sfnt_off0000f93d.bin
cf16b2b57632a2a5abc2cfd1190c4229a858da867f2d69dd53946dd6e040a5f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF93D 11008 bytes

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