Malicious PDF — malware analysis report

Static analysis result for SHA-256 f975da4de09f7a2e…

MALICIOUS

PDF

78.9 KB Created: 2021-03-16 20:11:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b082025fb8a9706ce7ba9284a381130c SHA-1: aedae6cd9b0f1017dc9d950d263600bad371d8ff SHA-256: f975da4de09f7a2e0d0d42c877f1fbaa317710696eb5081f39ef6738ff4ff73c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or SEO spam campaign. ClamAV and ML classifiers identified the file as malicious, specifically a phishing trojan. While no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://golowaki.ru/strik?utm_term=heil+furnace+exhaust+blower+motor PDF link annotation
    • https://cdn.sqhk.co/gaxozamikoge/nQLcgfF/natural_nails_spa_college_station_tx.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/cxipyij/wedding_hair_and_makeup_artist_melbourne.pdfIn PDF document text
    • http://reactivascotia2020.com/66285200195hjow1.pdfIn PDF document text
    • http://nowtorrentz.com/rutiwup25lx.pdfIn PDF document text
    • https://cdn.sqhk.co/lagusive/Jifiahj/lamex.pdfIn PDF document text
    • https://cdn.sqhk.co/rofezurit/ifzgfie/bhaagamathie_movie_songs_malayalam.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
    • https://uploads.strikinglycdn.com/files/8fa91fd4-c389-4837-bc67-76a099088bd2/speed_queen_washing_machine_repairs_cape_town.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b2aad38-c5b3-4f50-b91d-7bea9d30a945/thanksgiving_phonics_worksheets_1st_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f6e0996-c259-4e4f-81f0-bd704d62c654/what_are_the_seven_gods_of_mesopotamia.pdfIn PDF document text
    • http://datatoxozapi.epizy.com/raxisajupiliruvisenodituz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afe96932-cc41-404f-a43d-dfc4710f7870/figurative_language_in_the_giver_chapter_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adadb0cf-8ffb-4554-b30a-7e1e13de64aa/convict_conditioning_book_for_sale.pdfIn PDF document text
    • http://vububogux.epizy.com/tenancy_addendum_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4802f041-2f7d-4428-bf00-3b96784af634/sawadoruwufuk.pdfIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_55b54a8a9d184e6b8daa256d5ccfea40.pdf?index=trueIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_4057038d1419470f886890c3b4d2af29.pdf?index=trueIn PDF document text
    • http://baxibajiduvedi.rf.gd/tadufaja.pdfIn PDF document text
    • https://6ba7316d-b84b-4ccb-a32a-103c856d4013.filesusr.com/ugd/91f37e_a5d589d28315490980ca84575c6fbd91.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9575a61a-a671-4cc3-8538-ed36ed22d933/how_do_i_use_my_weight_watchers_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccf5557c-425f-4eb5-924e-d3239fa2f725/jepatusunitozanijak.pdfIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_599572f2207e419f840c863627c5d93e.pdf?index=trueIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_188f5e8b2ef841c3bc5b2c3039b120ab.pdf?index=trueIn PDF document text
    • http://fojemagiro.rf.gd/28334385953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7f4002e-dbc7-4bc3-995a-c6bf6b369cd9/zogupezakesofigolenoxifu.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_off0000ecf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 5264 bytes
SHA-256: 44e28e335691b97a8fad6da06747ed036547cfa6908046d80cf26088a274971e
font_01_sfnt_off0000feb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB4 9692 bytes
SHA-256: e95cc28fe343721c3f919141cf306a5451e20cfaebf2f4df7b6b86c94a9a28fd
font_02_sfnt_off00011ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFB 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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