Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8fc08b6a7c1d8cf…

MALICIOUS

PDF

75.1 KB Created: 2021-03-28 04:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: af8c12c52a66b9e40b1a6e5aed7623b2 SHA-1: aed360bfe4a47ac20a51f53fbb29794d6f7d2919 SHA-256: a8fc08b6a7c1d8cf07134141fbd21c892c65521ebc568daf8ecf0a2934ab74c6
136 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. The document body and heuristics indicate it uses a lure related to 'gas laws practice answers' and contains an external URI pointing to a redirector, suggesting a phishing or scam attempt. No scripts were extracted, but the overall pattern points to a malicious document designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/wix?keyword=gas+laws+practice+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370073/normal_6024799ab5c96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494435/normal_6013ebea12362.pdfIn PDF document text
    • https://cdn.sqhk.co/miwavilusaji/icjiXhi/new_las_vegas_slot_machines_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/wupifufexix/d3gjcL5/50373015741.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/jHjblMp/trench_conditions_ww1_facts.pdfIn PDF document text
    • https://cdn.sqhk.co/kufejagefep/gh1N4hi/gamefly_login_desktop.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuronufepu/jhAKSlE/nfl_network_channel_on_spectrum_ny.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/igjc7hb/wexurevumexuzubavumonok.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/Nijidpt/top_free_usa_dating_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370275/normal_60262eef575c1.pdfIn PDF document text
    • https://cdn.sqhk.co/sevalaturi/pjj9QhH/tv_show_quiz_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/gubisagebuto/uvHggDB/business_administration_and_management_degree_description.pdfIn PDF document text
    • https://cdn.sqhk.co/latosagax/ZhbgFoq/enter_gps_coordinates_google_maps_android.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/0b5a29de-ff12-40fe-8c65-e21f4edff7c7/reladuvulixuxupimifinaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85464a7e-e57f-405f-93d0-e47dca638d04/95758329563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d4a9fbc-45a0-4b41-a4f5-4d6031d0fc1d/xikesipalawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b29b843-6e49-4a95-9f93-d227647825aa/how_do_i_stop_my_first_alert_smoke_detector_from_chirping.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d7fbe4-79de-4af1-9cd9-45160b3fd837/suxusirotiwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f5b8000-35ca-4876-9e84-65fedcda139a/jowiwaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c27aec41-22a3-4fea-8458-e667220571d4/navy_seals_crest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e39dceca-aa32-4410-ab89-ea6f23484ed3/book_report_outline_9th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a88a4ab9-b4bc-4bbc-996f-d34d9f603a4e/senovapis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eafd168-9f90-43e6-bf0a-737d0deb6434/que_pasa_cuando_se_te_hinchan_las_venas_de_las_manos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/576710eb-439e-4cf5-8f42-9a041e4c0e19/viminategunotovudosex.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_off0000e825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 5048 bytes
SHA-256: 56e378f226541bc80c29a136939bc77e08658219a2c00519d1fb08e75ef12fe6
font_01_sfnt_off0000f977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 11004 bytes
SHA-256: 6b1df5859aab5016e5e81a9b89d0ca0f399770c93c81193771dbc3796dae3f74