Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0914b16d7f534f9…

MALICIOUS

PDF

64.1 KB Created: 2021-04-05 06:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 1380593422d79a8a2f29f177aa6fb9ed SHA-1: 1ceefa24f86d05733c9817fd6ac83640b7dfe757 SHA-256: b0914b16d7f534f9511bfc7e6237e670c7b8bb161d8fc3bba5b2cc8e0b6403e5
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious sites, likely as part of a phishing or SEO scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://ponafet.ru/wix?keyword=plotting+logistic+regression+in+rstudio PDF link annotation
    • http://befigter.xyz/padizozofgssg9.pdfIn PDF document text
    • https://jidisoluko.weebly.com/uploads/1/3/6/0/136097174/2d11cfc.pdfIn PDF document text
    • http://tomogorman.com/delete_text_from_file_onlinek1vj4.pdfIn PDF document text
    • http://meetplafond.xyz/how_to_make_daphnia_without_starterewxmi.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/4ggSifr/vunibusirosi.pdfIn PDF document text
    • https://foxogitasi.weebly.com/uploads/1/3/2/7/132740511/pazilelif.pdfIn PDF document text
    • http://meetsucre.pro/ralekesalunadoguj1efuo.pdfIn PDF document text
    • http://garderob-podolsk.ru/73878035497w7712.pdfIn PDF document text
    • https://cdn.sqhk.co/tixuniwe/lifehio/88946143450.pdfIn PDF document text
    • https://cdn.sqhk.co/zodenizekija/0axhhnP/78771031069.pdfIn PDF document text
    • https://cdn.sqhk.co/bomunerafoju/fMgjRib/sivomeba.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/mIijJep/wise_eye_on_39_full_crack.pdfIn PDF document text
    • https://cdn.sqhk.co/panafilaputu/LhfHheM/traffic_racer_2_3d_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xebosulog/jf6qidG/fafuneganimakunov.pdfIn PDF document text
    • https://silavetej.weebly.com/uploads/1/3/5/3/135314504/bupij.pdfIn PDF document text
    • https://ludebopukum.weebly.com/uploads/1/3/1/3/131380916/bujovi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef52e84a-ee73-47ea-926a-348d3a9e6977/lepegeja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/178bec10-e35b-42be-a113-14c0c52eaed3/what_are_the_impacts_of_climate_change_in_bangladesh.pdfIn PDF document text
    • http://vetuvadoxawiton.epizy.com/44515392603.pdfIn PDF document text
    • http://jomolupumiroj.rf.gd/whats_the_strongest_weapon_in_dark_souls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28277fb7-bdaf-4fee-8a7a-e3ccdb9d1890/learn_autocad_3d.pdfIn PDF document text
    • http://femasusatatovet.epizy.com/caterpillar_butterfly_coloring_sheet.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC028 4900 bytes
SHA-256: e9c71b253082cf76b7e9e049820cc7729cdddd5a9e778d622723dd8c9295ebbc
font_01_sfnt_off0000d0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E5 9512 bytes
SHA-256: a01b9f2457d4287a08b3c9a31b91e93fe733e9d69fb509f69d4838a32edfb150