Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad787076f7e913d3…

MALICIOUS

PDF

97.3 KB Created: 2021-04-30 20:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 72981bfa5b8c832c9588d14752c59de1 SHA-1: 95efd77bca6e20c1c3dd4bcb91b323b73496dc78 SHA-256: ad787076f7e913d3f5181fe9212d0a62999712b4ac5cbbb7d4d5b996f6dd2c50
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm and an SEO redirector. The primary malicious URL, 'https://fokemale.ru/strik?utm_term=at+lp120+cartridge+weight', is used in an image lure, suggesting a phishing or malware distribution attempt. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the PDF structure and link farm indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://fokemale.ru/strik?utm_term=at+lp120+cartridge+weight PDF link annotation
    • http://kafalogu.22web.org/ap_seminar_irr_examples_2020.pdfIn PDF document text
    • http://kusadelopo.iblogger.org/special_26_songs_bestwap.pdfIn PDF document text
    • http://takovod.66ghz.com/42142130931.pdfIn PDF document text
    • http://bezigex.iblogger.org/cardi_b_money_performance_grammy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/achtergrond_kleur_word_naar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/214837b8-c196-4baf-a8d6-2df9b2999735/the_hunger_games_mockingjay_full_movie_download_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/nopetolumizisuzobedizani.pdfIn PDF document text
    • http://wazisosixi.epizy.com/belawarulawuwibavukasatew.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_63413a94cecf4d2787aea22907685d87.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xidazeze/57175247476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2ead1e8-aca3-4afd-95e1-f62f93b9319d/adt_safewatch_pro_3000_default_installer_code.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/rekatedun.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/attune_nxt_performance_test.pdfIn PDF document text
    • https://11e0ccb5-01dd-4757-ae93-f6f3b4f5ca32.filesusr.com/ugd/1a2ce6_e83601c6d23f4d0582980a1c00e6e353.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/504ac7b7-ffd9-43be-9d1f-07174f15e1f2/73974111383.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/82595557013.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/electrical_cable_types_and_applications.pdfIn PDF document text
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_b33bbe84bcaa4ce6b4f6f9bb58c015a7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/60168688881.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/vovuwikiwuxasafifibopanut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b44f9bfc-4e92-410a-ab03-4f4a847f97bd/nixogijovesapuzalo.pdfIn PDF document text
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_3115e0684a7146889fc30b8b7d56d1b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/solemowokibedapagojok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57e24984-6243-42c1-aa36-80589705d0c8/40935492661.pdfIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_43b74a03114b4a25980d8cc27ae1ba1d.pdf?index=trueIn 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_off00013e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E25 5564 bytes
SHA-256: 915a937c2c3fccb48a8739fca82b1904dee53a35d0717e68d92ff1a1f7b40ba9
font_01_sfnt_off00015124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15124 11272 bytes
SHA-256: dd70d08af38a99161225b1368d5122bc5d83ec1afe0b3b3b0181f35899a4dfea