Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e8cf011eb4ff93…

MALICIOUS

PDF

81.3 KB Created: 2021-03-06 11:08:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9316ec637396eec98203e48db2c0a9d SHA-1: 2f9f5c4bd9c700d92fdf63ae65eeb953a94ca157 SHA-256: f6e8cf011eb4ff93037a87c8192abc1d3a5db4cc3e24212fa50795f551a77067
194 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. It contains a large number of external links, many hosted on 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 'Wordly wise book 8 answer key lesson 9', aiming to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/award?keyword=wordly+wise+book+8+answer+key+lesson+9
    • http://sefegusekepuxa.mypressonline.com/hp_elitebook_2740p_ram_specs.pdf
    • http://xexapitanegis.getenjoyment.net/vegefepovimuwepexil.pdf
    • http://paxezot.getenjoyment.net/bella_vita_salon__day_spa_leavenworth_ks.pdf
    • http://lenusabipowezo.getenjoyment.net/35532684770.pdf
    • https://ritosameb.weebly.com/uploads/1/3/4/2/134266106/pikozefoginuf.pdf
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/xajefusewiziwigix.pdf
    • https://gobodozi.weebly.com/uploads/1/3/1/3/131398455/9678146.pdf
    • https://rofazipupu.weebly.com/uploads/1/3/4/5/134580110/kifoxafujiru.pdf
    • https://tafubevodila.weebly.com/uploads/1/3/4/0/134016741/ronopopepezab.pdf
    • http://tivirazetuxozux.22web.org/bahadur_bengali_full_movie.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_a891a41f2d0648749ed6961c0f8e3d25.pdf?index=true
    • http://rowomasogig.epizy.com/investigation_report_sample_template.pdf
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_71c7f0172fce4a8aac2aee1ead6b9ea9.pdf?index=true
    • https://s3.amazonaws.com/fotepopunaj/josipovuzupipizun.pdf
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_550b5950c2af4940a665eb25b0617f1e.pdf?index=true
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_d728e27fcbe340bba4b1ab7739d64e30.pdf?index=true
    • https://s3.amazonaws.com/vebenok/wakudajezutedid.pdf
    • http://petizitopebil.epizy.com/60134776999.pdf
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_e21ab10ee7d3468cad92fe93e9e760ec.pdf?index=true
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_cd097962757f422480c77363662e332d.pdf?index=true
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_9e0e953ef5fe4c8bb3baeb6b358929ac.pdf?index=true
    • https://s3.amazonaws.com/kavugusepe/literatu.pdf
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_f39c0d53af724e96a776739d7a330ef3.pdf?index=true
    • http://jupegojut.atwebpages.com/dekifazulawaxetos.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_off0000f31f.bin
498a1da5164e2f7143369c0efde39b2f6a9f4284d01981165956c438197699b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 5288 bytes
font_01_sfnt_off0001052e.bin
0bffd705c9a6c414e42a2e2bcaa5fe16f095ab280e204cd286cd92f34742cc43
pdf-font-stream PDF embedded font (sfnt) at offset 0x1052E 10604 bytes
font_02_sfnt_off0001295d.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x1295D 4324 bytes