Malicious PDF — malware analysis report

Static analysis result for SHA-256 72759ba935135368…

MALICIOUS

PDF

82.0 KB Created: 2021-03-31 05:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6beb08a9cb1e0d5a328a907e99be8122 SHA-1: 6fe9efad9ac7eee5c83656c9a28e6a8932adacfc SHA-256: 72759ba935135368301c176820e92aa0b3e55a802d854c2403f8ef9a877e3320
184 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, appears to contain metadata related to the file's creation and potentially search terms, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=hardy+weinberg+problem+set+dragons+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372076/normal_603ce397c5a26.pdfIn PDF document text
    • http://fruit-citrus.space/simplehuman_mirror_not_turning_ona2jk3.pdfIn PDF document text
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/tuludujugeb_tutag_boresover_sinotisuxun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412896/normal_602e5b87a20e0.pdfIn PDF document text
    • https://livadekawa.weebly.com/uploads/1/3/5/3/135317457/gagotes.pdfIn PDF document text
    • http://shimano-stradic.ru/89559114650g5m6b.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/how_to_write_an_ebook_for_amazonzyg37.pdfIn PDF document text
    • http://axecheat8.xyz/walking_robots_toysd7x94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492250/normal_5ffbc50e4d3c6.pdfIn PDF document text
    • https://tatisosef.weebly.com/uploads/1/3/5/3/135333589/d212d0.pdfIn PDF document text
    • http://fruct.space/tiwekomezot20ejw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470837/normal_5fd392dacaa71.pdfIn PDF document text
    • http://tojumuwuluso.iblogger.org/hereditary_angioedema_guidelines_uk.pdfIn PDF document text
    • http://dixurujisefumet.22web.org/91174943759.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jexuzutipeku.epizy.com/why_wont_my_dishwasher_drain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57ebf0a7-3fd5-49d5-a2df-664668adec8c/the_narrative_of_the_life_of_frederick_douglass_chapter_7_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f47b8f2-922a-445a-8879-85cf22991bda/why_is_my_dodge_grand_caravan_overheating.pdfIn PDF document text
    • http://diwuvugu.epizy.com/51489115091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fa47ffd-eb18-4b34-9435-a608a054ddf6/riders_of_the_purple_sage_1996.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 5360 bytes
SHA-256: 45403c9fbe11ea0fe4d5652a3cfdda82386b6d8ccbf93b6d8e5164732b76e10a
font_01_sfnt_off00010699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10699 11072 bytes
SHA-256: 4f8b02dc5e77f5a552c15ce84d81fe4aa3eb2dd8124708d345e4136f261c1c6c
font_02_sfnt_off00012c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C65 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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