Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d6c50263f1df84…

MALICIOUS

PDF

87.1 KB Created: 2021-04-20 02:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7691bfa8f4c40cddd4a20261d5a1f2f4 SHA-1: d6f7232f1329d282c5df16cf99d4cde2640c15df SHA-256: d5d6c50263f1df848cc8b42511363e3e575db767d8f38dcfa6216b95622e6cbc
216 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning attempt. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document actively requests sensitive information such as private keys or recovery phrases. While no scripts were explicitly extracted, the presence of numerous external URLs and the nature of the requested information strongly suggest a phishing or credential harvesting attack. The ClamAV detection further supports its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://jacksth.ru/strik?utm_term=python+pdfminer+sample
    • http://tugesajudefuk.iblogger.org/libros_abraham_hicks.pdf
    • http://fomijegi.mypressonline.com/keraruvuzatekuka.pdf
    • http://maruwikugob.iblogger.org/bojuwabumifojemejepa.pdf
    • http://zuviwadakaji.22web.org/axiomas_de_zurique_audiobook.pdf
    • http://tikanaw.mypressonline.com/11058782181.pdf
    • http://mezeferatitora.scienceontheweb.net/93994862669.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zaxuzut.atwebpages.com/winisem.pdf
    • http://zudagiropa.rf.gd/luwepiwivamu.pdf
    • https://s3.amazonaws.com/jixerubowi/1131075906.pdf
    • https://s3.amazonaws.com/dobesogum/22306622511.pdf
    • https://0f939073-77d1-4307-aaa8-42539c8515e3.filesusr.com/ugd/85c9df_2427d971e5a14826a2234f7701b80567.pdf?index=true
    • https://s3.amazonaws.com/xixonu/taxi_driver_songs_free.pdf
    • https://s3.amazonaws.com/norozovijalu/2510318173.pdf
    • http://vexidolovosope.rf.gd/analysis_of_categorical_data_with_r.pdf
    • https://s3.amazonaws.com/gavobawum/bending_stress.pdf
    • https://s3.amazonaws.com/jajoxulabojaso/panasonic_cordless_phone_manual_kx-tgfa30.pdf
    • http://nimobavaze.epizy.com/declare_openly_crossword_answer.pdf
    • http://wuragumok.atwebpages.com/credit_card_authorization_form_fillable_free.pdf
    • https://18bc7be3-897e-46c1-a475-efc190d089bd.filesusr.com/ugd/62845f_8fb528231847450ab1ea29b689d659e7.pdf?index=true
    • https://s3.amazonaws.com/fofeguj/android_mobile_below_3000_4g.pdf
    • https://s3.amazonaws.com/boduxatavepe/how_to_administer_medication_through_a_peg_tube.pdf
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_59141dacab4d47f4abc126c490fcc681.pdf?index=true
    • 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_off000119a7.bin
0b34139fad1d954622cadb886f493886314e88266dc5f7544d4052505d02018b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119A7 5384 bytes
font_01_sfnt_off00012bd4.bin
b86e9627c1475e3eac55073eb543d48e07cb069bfecde2cf06c2cbccc78b2134		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD4 10508 bytes

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