Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa98dd7d40b53268…

MALICIOUS

PDF

70.8 KB Created: 2021-02-13 16:43:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c344ad90fecdb2b1efdf17e21c70c55 SHA-1: 74abf65d38410949c4d64866e609060d70ed5cc9 SHA-256: aa98dd7d40b5326898fd29c162f56b47c20a1907dda3539077233e847c960ba7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique commonly used in SEO spam and phishing campaigns to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document's primary purpose is to redirect users to potentially harmful content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=analog+gauge+reader
    • http://eu-study.ru/70405999482p4g0o.pdf
    • https://netexebi.weebly.com/uploads/1/3/0/8/130815192/4447050.pdf
    • https://fobijolosa.weebly.com/uploads/1/3/4/7/134730704/vibov_vujulivezi_pubas.pdf
    • https://gopopozemilin.weebly.com/uploads/1/3/0/8/130874381/566b5.pdf
    • https://lemarowaverixax.weebly.com/uploads/1/3/4/3/134371099/7285237.pdf
    • https://lodikesilir.weebly.com/uploads/1/3/4/8/134868057/fibipe_dopajemavi_bovonuzek_navenilanevemur.pdf
    • https://kodirovotosin.weebly.com/uploads/1/3/2/8/132814250/gifosodad_gokabupotoxadi_kagisaparetuvob.pdf
    • http://pokupka.space/rogapejugawesezixevdigxx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pevuwarobuvowa/dusedex.pdf
    • https://s3.amazonaws.com/sowirutelevolur/1237973520.pdf
    • https://s3.amazonaws.com/jupoti/sotopewopizel.pdf
    • https://s3.amazonaws.com/dezajok/rijunulaburoku.pdf
    • https://s3.amazonaws.com/tujeviwakirawu/78138113968.pdf
    • https://s3.amazonaws.com/sazomo/kukixigojorud.pdf
    • https://s3.amazonaws.com/davubewu/araba_park_etme_oyunu_indir_android.pdf
    • https://s3.amazonaws.com/kokesatodixon/vidmate_hd_for_pc_free.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_off0000dac0.bin
3e1bff8471c96ae4f9f70d78ecbcf2226fd0920026f3e34eaa74f81187f7b735
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC0 4804 bytes
font_01_sfnt_off0000eb21.bin
8dc97954a2070c8fd82bb6592b50fa849ff58e75ddfb5e2107f01ad9aa8a231f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 10240 bytes