Malicious PDF — malware analysis report

Static analysis result for SHA-256 031ac86ff3549641…

MALICIOUS

PDF

73.6 KB Created: 2021-03-15 05:07:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4cc9342cc49b649085cd6b5173c8854 SHA-1: 193d6052f135c35d1249e0634ecd41a3ddabf352 SHA-256: 031ac86ff354964160794b9aa624cb31bf91802b58ed8d4510f678cbc26977ee
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely to manipulate search engine results or host further malicious content. The presence of external URIs further supports this, with one notable URL being https://soxebez.ru/123?utm_term=tamil+news+paper++software. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/123?utm_term=tamil+news+paper++software
    • https://cdn.sqhk.co/fafojipedul/ku8Dzq5/filmywap_movie_2019_kabir_singh.pdf
    • https://cdn-cms.f-static.net/uploads/4489609/normal_60426df5263d6.pdf
    • https://cdn-cms.f-static.net/uploads/4414331/normal_601fb646b91f4.pdf
    • https://larezonisu.weebly.com/uploads/1/3/0/7/130738889/b59f1fa19cff0.pdf
    • https://cdn-cms.f-static.net/uploads/4465564/normal_5fd30a0cca067.pdf
    • https://cdn.sqhk.co/towevefizub/ZXujh9W/download_big_launcher_pro_apk.pdf
    • https://rebopugosoge.weebly.com/uploads/1/3/5/3/135346619/matefebogopemiv.pdf
    • https://cdn-cms.f-static.net/uploads/4370777/normal_5fd2cc3584e64.pdf
    • https://cdn-cms.f-static.net/uploads/4486994/normal_602127831d2a0.pdf
    • https://static.s123-cdn-static.com/uploads/4489586/normal_5ffcd9fd16833.pdf
    • http://refowozawigut.22web.org/systematic_approaches_to_a_successful_literature_review_booth.pdf
    • https://xowitato.weebly.com/uploads/1/3/0/7/130776358/jijakitaworabo_tuziludumumexa_kurulumod.pdf
    • https://static.s123-cdn-static.com/uploads/4451210/normal_5ff7fe65893ce.pdf
    • https://cdn-cms.f-static.net/uploads/4460251/normal_5fd158fe30414.pdf
    • http://geponimodenebev.22web.org/xaxufe.pdf
    • https://cdn-cms.f-static.net/uploads/4494433/normal_5fe76f7609d66.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/3237d3a9-6c86-4d54-8cad-9a12549e2dd4/fijulupediwax.pdf
    • https://uploads.strikinglycdn.com/files/aee88dd8-148f-4ffc-b563-8e06999def9c/xusenaxesikegepirosew.pdf
    • https://uploads.strikinglycdn.com/files/5433ea33-dd85-4f00-b0e4-e7cebd1ed35f/79113733379.pdf
    • http://kovusipeduza.epizy.com/android_push_notification_example_in_android_studio.pdf
    • https://uploads.strikinglycdn.com/files/7ad628c7-fe4c-41a0-a45c-a3516ab5d28a/how_hard_is_the_ham_radio_exam.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5fa.bin
14b5b3b4a5c53094565c39e9eb896e8a1d9ba857d8bce3ba23e3d2524ee7b1a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FA 5088 bytes
font_01_sfnt_off0000e73d.bin
a01d7532da87ff76f97828eb24ac833c6820401b0fdc69e60d2e1842ca9e8277
pdf-font-stream PDF embedded font (sfnt) at offset 0xE73D 3432 bytes
font_02_sfnt_off0000f3fa.bin
b243f9a170e19889731e52de82db4448f0540e9b6183fe8e7a66891718692901
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FA 10928 bytes