Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e425ab0f2d4a3d…

MALICIOUS

PDF

74.9 KB Created: 2021-03-31 15:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a73b766420a892f6701260b717991133 SHA-1: b44fb5e320ed062b8f0df7aec9ad5acaf58aa756 SHA-256: c5e425ab0f2d4a3d23508f61bef8eb473d64e5a089ef3d335d1a921e34d4bd44
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism for phishing or malware delivery. The document body, though heavily obfuscated, contains keywords related to 'cancellation letter sample pdf', indicating a lure to trick users into clicking on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/award?keyword=cancellation+letter+sample+pdf PDF link annotation
    • http://tagukefinifofe.iblogger.org/root_explorer_android_4._3.pdfIn PDF document text
    • http://bopugafuwu.scienceontheweb.net/segmentation_definition.pdfIn PDF document text
    • http://kixorita.22web.org/kimigayo_piano_sheet_music.pdfIn PDF document text
    • http://pabixigenived.22web.org/kuwonemelagabobejona.pdfIn PDF document text
    • http://sopesukenapad.scienceontheweb.net/vikenix.pdfIn PDF document text
    • http://niluwipewuxasa.medianewsonline.com/helter_skelter_zombie_manson_lyrics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c538924d-9290-4e35-808b-5013ecaac822.filesusr.com/ugd/047ea9_7d6fdba985874172a5e79ced7979ed18.pdf?index=trueIn PDF document text
    • https://2a04f01a-7147-4793-98aa-b59dc93e6f96.filesusr.com/ugd/efcdeb_4e2cae82efae44a98103d991f51fa88a.pdf?index=trueIn PDF document text
    • http://fenigubigona.epizy.com/nivijeradalopowagu.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/madatulazeritisuteku.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/english_book_authors_names_list.pdfIn PDF document text
    • http://dolanuvusipegu.myartsonline.com/53598311977.pdfIn PDF document text
    • http://fogalefudomuj.epizy.com/41248930980.pdfIn PDF document text
    • http://namepafubi.atwebpages.com/20579453676.pdfIn PDF document text
    • http://gifemidarokefex.rf.gd/40116723731.pdfIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_912d89a2ccb5484fa31d76a673abc5bd.pdf?index=trueIn PDF document text
    • http://kidoputuf.epizy.com/bluestacks_free_full_version_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/endless_love_full_movie_hd_popcorn.pdfIn PDF document text
    • https://7054f9d6-44ea-4b6c-8535-0d04e7cb9957.filesusr.com/ugd/963b03_bedba9320aaa4630abeb0f22712d1cd3.pdf?index=trueIn 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_off0000e82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82D 5208 bytes
SHA-256: 3ba31b2a450b5c015e1fab38ff4fcd0c7e8630a2a1fb6f566cdf7430f2692ed4
font_01_sfnt_off0000f9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CA 10816 bytes
SHA-256: 1fbbd5f903828ff0a65b34ff31f93b2171a5ef386b0ad0a15e925b35c6f58c65

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