Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe31e719822ef3c…

MALICIOUS

PDF

80.4 KB Created: 2021-04-04 16:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8d13049b64f25edfd04ee870b8d560f7 SHA-1: 48b3390dfc5ae97f5fa982218c3446ca86fd3ced SHA-256: fbe31e719822ef3ca9c67111696423dc946d2fe4312c4c17b63061a93d505110
126 Risk Score

Malware Insights

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

The PDF file was 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 designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a book summary, which is a common tactic for phishing or malware delivery.

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://bologen.ru/strik?utm_term=chela+sandoval+methodology+of+the+oppressed+summary PDF link annotation
    • http://devlp.club/324433083536v1e5.pdfIn PDF document text
    • http://japancar-sib.ru/womens_oxford_style_golf_shoesw0l29.pdfIn PDF document text
    • http://7lessons.website/how_long_to_learn_cfopy7x60.pdfIn PDF document text
    • http://salizurewaki.mypressonline.com/rimalabavivifunasoginumom.pdfIn PDF document text
    • http://larebalin.mypressonline.com/ryobi_backpack_blower_ry38bp_parts.pdfIn PDF document text
    • http://mebets.xyz/6305339460j1yt.pdfIn PDF document text
    • http://cenderaoriginator.com/making_leather_knife_sheath_booklg2os.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_e6039490e0fa45b3b6a669de4ce59bc3.pdf?index=trueIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_88431945a0b04a5aa7b31b5a92960e27.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/avital_4103lx_remote_start.pdfIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_f1be0ecd556e4265825c0d3545af7d20.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/perurulexi/jupexituli.pdfIn PDF document text
    • http://zejibanunepi.myartsonline.com/how_did_the_amnesty_act_of_1872_influence_reconstruction_brainly.pdfIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_421f6191dbdc45019eab94d5ac391ec7.pdf?index=trueIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_3d87639f9a1544faa793b23622174e9f.pdf?index=trueIn PDF document text
    • http://peledopa.myartsonline.com/8399399136.pdfIn PDF document text
    • http://gukutimaguvuzum.onlinewebshop.net/62683209293.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/usb_memory_stick_compatibility.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_off0000fc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5F 5520 bytes
SHA-256: 1d9e772582859d23b44e343f8c43629896065bccb73a12478bb12552c294a43a
font_01_sfnt_off00010f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0D 11280 bytes
SHA-256: 9f1da19aebb1db088e6bdf9cce95bd9910d3ad77378c62e3b337cc3f2914e1ee

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