Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ae55d881ec37a6…

MALICIOUS

PDF

76.0 KB Created: 2021-02-06 17:28:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8a9ec679d5e51bbbcf2a18368a5c806f SHA-1: d04ceefeae6789de34e24fc88b596937476d1727 SHA-256: b7ae55d881ec37a67e185e88077de7798d32a23a2443d7873ddb1ca9aa6d22de
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting or redirector infrastructure, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were extracted, the presence of numerous external links suggests an attempt to lure users to malicious websites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://crophysi.ru/aws?utm_term=difference+between+android+version+and+api+level In PDF document text
    • https://jawuwokobot.weebly.com/uploads/1/3/1/3/131381435/6c31af087.pdfIn PDF document text
    • http://avit0.pro/shadow_the_hedgehog_ps2_iso_espaol_megaf1pzh.pdfIn PDF document text
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/8114190.pdfIn PDF document text
    • https://sujosajuzatitoz.weebly.com/uploads/1/3/5/3/135312362/f51959ed18.pdfIn PDF document text
    • https://poximixej.weebly.com/uploads/1/3/0/7/130776069/5890790.pdfIn PDF document text
    • https://sozuxeboniwuk.weebly.com/uploads/1/3/1/3/131381135/pojap.pdfIn PDF document text
    • http://sexesex.site/venmo_account_setup_for_business901oi.pdfIn PDF document text
    • https://xagomutub.weebly.com/uploads/1/3/4/3/134321984/1353023.pdfIn PDF document text
    • http://plsale.pro/rolling_sky_2019_apkehkj0.pdfIn PDF document text
    • http://unityfree.xyz/61924797894qbtas.pdfIn PDF document text
    • https://furiraduwonejos.weebly.com/uploads/1/3/4/8/134870793/vibopegelitijizinor.pdfIn PDF document text
    • http://leree4.club/basketball_3d_shooting_game_arcadeol9dj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/blaze_and_the_monster_machines_games.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/lumiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/shiloh_jolie_pitt_2019_transformation.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_off0000ec29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 5440 bytes
SHA-256: ce809238b0464795bef4cadadd597c865509001f7e59a7eaee90a00ee281fac6
font_01_sfnt_off0000fed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED5 10708 bytes
SHA-256: 43b1fb84bb1fd81ec1519a2a1085db1d1e2bd8b9ca83ab741ae39dc3c850b00a

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