Malicious PDF — malware analysis report

Static analysis result for SHA-256 251593ac8f84990d…

MALICIOUS

PDF

79.0 KB Created: 2021-03-11 19:50:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19a2fcb1a695443c54419f082b969e4c SHA-1: 1d11f5bb52d90475e4338ed4179e4fd491060dbc SHA-256: 251593ac8f84990db228173b6d6f04eab8af0caafe3a4d4b3719bbed4f9f4ca7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are generated in a pattern typical of SEO link farms, suggesting a malicious intent to drive traffic or distribute further payloads. The ClamAV detection and ML classifier strongly indicate malicious content. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/award?keyword=cambridge+pet+4+pdf
    • https://fapopadiwa.weebly.com/uploads/1/3/1/4/131438416/jitukofif-dexumivelunu-kogitebaw.pdf
    • https://zogowejodumuf.weebly.com/uploads/1/3/0/7/130775171/lejabelad_wobomulisuze_junimoxaga_xidudifowujopil.pdf
    • https://cdn.sqhk.co/pefisemise/LBbf6hg/best_tuner_metronome_app.pdf
    • https://woxazalaxit.weebly.com/uploads/1/3/4/2/134235403/c1f5e.pdf
    • https://tunoworuv.weebly.com/uploads/1/3/4/0/134017870/sujanetixukatobojaz.pdf
    • http://insta-sale.site/abcd_1_full_movie_in_hindi_free_downloadatkjh.pdf
    • http://reduslim-italy.site/kidde_smoke_alarm_reset_buttone3sez.pdf
    • https://cdn.sqhk.co/jimatoju/jbKhgeY/guidestar_pro_cost.pdf
    • http://dapumad.iblogger.org/big_easy_turkey_fryer_chicken_recipes.pdf
    • http://peuer.xyz/waleniketevekatuxuzatuewipx.pdf
    • https://cdn.sqhk.co/bimepefav/jbdibib/tuzuze.pdf
    • https://cdn.sqhk.co/giwumazusew/4fpJTbp/bamivajirekobuxaditemesam.pdf
    • https://cdn-cms.f-static.net/uploads/4489244/normal_5fd2c75c94823.pdf
    • https://torolanomopefi.weebly.com/uploads/1/3/0/7/130739669/66a7f95db.pdf
    • https://fufuwotasivixi.weebly.com/uploads/1/3/5/9/135966690/dosobutexijuvolanet.pdf
    • https://ralixuviromod.weebly.com/uploads/1/3/5/3/135345966/e8aea74bae.pdf
    • https://cdn-cms.f-static.net/uploads/4368732/normal_604703bf612a6.pdf
    • https://jujoxiro.weebly.com/uploads/1/3/4/8/134875196/1035920.pdf
    • https://cdn.sqhk.co/senosekagoko/hg2x2F4/48961424487.pdf
    • https://kavikazu.weebly.com/uploads/1/3/5/3/135392310/zegavexap-vovibisoduje-pububosozu-xumoba.pdf
    • https://cdn-cms.f-static.net/uploads/4481993/normal_5fdb89e56ac4d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wujawejibizub.epizy.com/bully_kutta_image.pdf
    • http://datidogebe.epizy.com/cast_acrylic_sheet_properties.pdf
    • http://zepibugab.rf.gd/3942890418.pdf
    • http://walexesanub.rf.gd/bojiledixilokomejab.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_off0000f842.bin
9dfa99dd36a5d79693c89b58eb920e747dbc50dfa4b7ca4c90e49613a0e08b6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF842 5284 bytes
font_01_sfnt_off00010a23.bin
ab73ceb2cdd5d3c4bec84a86aa78e41eaf542d6cffee53a1c09c4bc8b9fe1b23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A23 10644 bytes

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