Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84021220fd728f8…

MALICIOUS

PDF

113.2 KB Created: 2021-03-25 09:28:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d850be39356c4af55fdfdfb747e1e88d SHA-1: ebde8a98b23b6576f219ec86800230f487dee90f SHA-256: d84021220fd728f8b20bd619102298927e767053135b2e86cba54815eca6c1ab
164 Risk Score

Malware Insights

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

This PDF document contains numerous external links, indicative of a link farm or phishing attempt, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'SE_INVOICE_LURE' suggests the document's content is designed to mimic an invoice or payment request to entice users to click on the embedded malicious URLs. No scripts were extracted, but the presence of many external links points to a phishing or malicious content delivery strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=take+charge+today+evans+income+and+expense+statement+answer+key
    • https://xobojurum.weebly.com/uploads/1/3/4/5/134599739/guwikugotabavika.pdf
    • https://cdn.sqhk.co/mekurapiw/ggjclG9/reborn_dolls_cheap_black.pdf
    • https://bokefelefu.weebly.com/uploads/1/3/1/3/131383825/d33c8682f3ed48.pdf
    • https://cdn.sqhk.co/pisomuma/kPBguib/dragon_quest_8_jessica_bunny_outfit.pdf
    • https://cdn.sqhk.co/banamasuvaj/eDjhimu/gain_more_followers_on_instagram_app.pdf
    • https://sefariduzaki.weebly.com/uploads/1/3/4/6/134665623/zorewepatazivol_gezorudonaw_seviti_mumuku.pdf
    • http://mebovaduzi.mywebcommunity.org/krk_rokit_5_g3_studio_monitor_pair_5_inch__stealth.pdf
    • https://wekosidofanepa.weebly.com/uploads/1/3/2/6/132696212/sivedogu-rojebuj-wafapanirisarud-vurerepisuros.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tugabijenovili/bugopiduxegekare.pdf
    • http://zitilidi.rf.gd/is_abiquiu_lake_open_covid.pdf
    • http://mudatelifawuvo.rf.gd/27267772106.pdf
    • https://s3.amazonaws.com/sazariwapa/74505303938.pdf
    • http://tamefizorala.epizy.com/lagu_no_sleep_the_bootleg_boy.pdf
    • http://soranodabiwegi.myartsonline.com/75061639080.pdf
    • https://s3.amazonaws.com/jofunozuzof/90912036499.pdf
    • https://s3.amazonaws.com/tinivukedeta/is_the_mini_mental_status_exam_copyright.pdf
    • https://s3.amazonaws.com/pasawexawinogad/single_phase_transformer_amperage_calculator.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_off0001701f.bin
7d44454dc1c3e2cc34d1b8547f3f5f6ba99b7a15e4ac5c124b87d98b237f8851		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1701F 5580 bytes
font_01_sfnt_off00018309.bin
bd22865a00bcf29643449b6359fc74938adf29728a40345a96f19d53e2750042		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18309 10908 bytes
font_02_sfnt_off0001a829.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A829 4324 bytes

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