Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d23bf692a1498b…

MALICIOUS

PDF

76.4 KB Created: 2021-04-08 06:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d32f5f0cff7333351943f9288ee4d9b SHA-1: 2be5b378e9c7c922caeaf946cacae48f18890454 SHA-256: c4d23bf692a1498b2e35f2e3e89afded033649ee55097714836caa3a07133d79
156 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 a large number of external links, indicating a link farm or redirection strategy. The embedded URLs suggest an attempt to direct users to potentially malicious or deceptive websites.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/wix?keyword=see+method+steps
    • https://soseriwu.weebly.com/uploads/1/3/4/8/134898980/2922916.pdf
    • https://pukotegifo.weebly.com/uploads/1/3/0/8/130874060/surarer-gamodanugirifud-xigul.pdf
    • https://ratipixudaxixix.weebly.com/uploads/1/3/4/4/134472160/zitonuse-jisam.pdf
    • https://sibemawiwojaro.weebly.com/uploads/1/3/4/8/134887292/1bc926.pdf
    • https://gikigafe.weebly.com/uploads/1/3/4/4/134440869/sozimubo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_b9c1c550b3c642beb6f1a423105adc86.pdf?index=true
    • https://s3.amazonaws.com/dusined/chamakam_lyrics_in_kannada.pdf
    • https://s3.amazonaws.com/tolivajupeku/the_significance_of_theory_terry_eagleton_summary.pdf
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_f23950b7da8e4ba481a8c774f97f6e40.pdf?index=true
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_9acab70213ee42f1b09e6e3382895e73.pdf?index=true
    • https://s3.amazonaws.com/tesapibebujep/24262397795.pdf
    • https://e33362eb-94ba-4427-a888-6f4863169a18.filesusr.com/ugd/36ce96_22d236b317204a29804c67f7ca70646f.pdf?index=true
    • https://s3.amazonaws.com/xilasisefi/vumiladavitoxopi.pdf
    • https://s3.amazonaws.com/nedijowewoded/the_lady_with_the_dog_analysis_characters.pdf
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_ef8485d98ce74da2bf9504829e43f3c1.pdf?index=true
    • 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_off0000efc1.bin
f442a65deaa17696d5504179643c1dd44dd858cea7d97b0739dd82db23071807
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC1 4964 bytes
font_01_sfnt_off0001007c.bin
8d3f50f44b82c236fb6925fd07055b93a0b61de52d0e3a692b4c9df1afa9f9d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1007C 10764 bytes