Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0eefff39b0a5689…

MALICIOUS

PDF

101.0 KB Created: 2021-04-06 18:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56df5ac204adf02f5d71151f31f2acc7 SHA-1: 29b6087f996e2a1d74756fec14890c6bdfa04f7c SHA-256: d0eefff39b0a5689eac634de9a085daee9e7d23886c3153adc455b8eaf6bb381
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a large number of external links, indicating a link farm strategy. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious or SEO-manipulated content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=teachers+introduction+letter+to+parents
    • https://vizexetu.weebly.com/uploads/1/3/4/8/134864552/88000adb0.pdf
    • https://jelopujepifo.weebly.com/uploads/1/3/4/3/134341958/4845711.pdf
    • http://kajipim.mypressonline.com/how_to_connect_wireless_printer_hp_photosmart_d110.pdf
    • https://wovasemuzusalej.weebly.com/uploads/1/3/1/6/131636629/mewezu.pdf
    • https://roxejozojone.weebly.com/uploads/1/3/0/9/130969259/gazajezusin_xalupigub_julosiwofax_dakewisa.pdf
    • https://xukizawumu.weebly.com/uploads/1/3/1/3/131380236/tibasozobaris-lodewolidelefux-lijumabenumuto.pdf
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/1808696.pdf
    • https://nurafotupitu.weebly.com/uploads/1/3/4/4/134495453/rukikuven-jopijo-xazam-wodelaxepixu.pdf
    • https://fofapisobav.weebly.com/uploads/1/3/4/7/134712410/dudolijagaz.pdf
    • https://kusazejur.weebly.com/uploads/1/3/1/4/131437880/3981f32e6ed3.pdf
    • https://murerodotabuvo.weebly.com/uploads/1/3/5/3/135327115/wenuzisede.pdf
    • http://fesufobototezer.mywebcommunity.org/experience_certificate_sample_for_electrical_engineer.pdf
    • https://vefitarusukop.weebly.com/uploads/1/3/4/0/134096120/8832522.pdf
    • https://favurujovonelod.weebly.com/uploads/1/3/4/4/134435517/nafajot.pdf
    • https://zekisotirateme.weebly.com/uploads/1/3/4/3/134368555/toped.pdf
    • https://resonorur.weebly.com/uploads/1/3/4/8/134874279/zixalexugid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://salajire.onlinewebshop.net/amar_ujala_epaper.pdf
    • http://sidepojedava.myartsonline.com/emulator_8086_tutorial.pdf
    • https://s3.amazonaws.com/rikolesafuwofar/6790512640.pdf
    • https://s3.amazonaws.com/fejakixoweka/17485392589.pdf
    • http://xolavozezimodan.onlinewebshop.net/wizards_of_the_coast_entry_level_jobs.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015002.bin
db8a85101a5adf624aa6069fe8bb725eb9460b86e0b51892dcb3fb7d7c060feb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15002 5112 bytes
font_01_sfnt_off00016158.bin
ff5728076c40d6f8d192c2584c43af2d667f5127e7b57233de7e5c93b0f32b67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16158 10332 bytes

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