Malicious PDF — malware analysis report

Static analysis result for SHA-256 97307a811a3e2e3a…

MALICIOUS

PDF

75.4 KB Created: 2021-02-28 06:42:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9a6b4d19bc2408202ec566538122b4eb SHA-1: f836bde1b2095f51d64b85b7e1d39ac0ee8df9f3 SHA-256: 97307a811a3e2e3a6efc89af057ad560fbca5a82392e3bfb08e5cd252a22fa02
146 Risk Score

Malware Insights

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

This PDF file contains a malformed stream and multiple embedded URLs, indicating malicious intent. The primary URL, 'https://fokemale.ru/strik?utm_term=cuanto+equivale+3+pulgadas+en+mm', is likely used to redirect users to a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to a search query, aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://fokemale.ru/strik?utm_term=cuanto+equivale+3+pulgadas+en+mm PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501810/normal_602b00f92a9db.pdfIn PDF document text
    • http://rp-youtube.fun/6260187096jhcc2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421614/normal_6004b0b5e1694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489846/normal_602b54055ee5b.pdfIn PDF document text
    • http://dalnoboyi.xyz/malekusotuzavim8lay.pdfIn PDF document text
    • http://copyrighthelp.info/165092151576l7jw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403274/normal_600458b4aa337.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381085/normal_60081d98cf3bc.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/ujcibhh/3459689147.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471091/normal_5fddc09965971.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tepobibofa.epizy.com/hunchback_of_notre_dame_musical_bootleg.pdfIn PDF document text
    • http://pigepitusedotet.rf.gd/pufapemok.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/bee_er_free_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/dream_league_soccer_classic_mod_apk_wendgames.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/aaron_neville_albums.pdfIn PDF document text
    • http://pijutisiguzog.rf.gd/gefezazexuvazixi.pdfIn PDF document text
    • http://baponexar.epizy.com/rekufilevupemu.pdfIn PDF document text
    • http://viposesarob.rf.gd/polk_magnifi_max_sr_5.1_soundbar_and_wireless_rear_speakers.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_off0000e4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E1 5436 bytes
SHA-256: 5d27a5fab001efbff7c92d0c81defa2f08e0d1a78f1d966ec8cc7233c2e87e26
font_01_sfnt_off0000f753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 12052 bytes
SHA-256: fb9d9deee0f48c7593be470cd47fda0452dd448f159aaf7ac4f3cfb201973fb5

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