Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b11873d5e75b30…

MALICIOUS

PDF

80.6 KB Created: 2021-05-15 14:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1a5244a632c351ddaade6435e3fded10 SHA-1: ba0d80a7530fdd76468ffa9dd603b9e980c701c1 SHA-256: 10b11873d5e75b30752a03d770eae0c7660ab2f75e59e9486b17449c819dc8c0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, including one that appears to be a search result for 'fluke 771 ebay'. This suggests the document is likely used for SEO spam or phishing, aiming to drive traffic to potentially malicious sites. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/strik?utm_term=fluke+771+ebay PDF link annotation
    • https://ketawisu.weebly.com/uploads/1/3/1/4/131454029/8793851.pdfIn PDF document text
    • http://nilitujawi.iblogger.org/mabiboforedabuxotiguzud.pdfIn PDF document text
    • https://xibemorebag.weebly.com/uploads/1/3/4/3/134355918/xedaxafamuvo.pdfIn PDF document text
    • http://wimazosuwoxugij.66ghz.com/21501301172.pdfIn PDF document text
    • https://siselujasukoju.weebly.com/uploads/1/3/0/9/130969984/gerodepadonad_ginederes_rogul_vazalewexevuk.pdfIn PDF document text
    • https://dumerozum.weebly.com/uploads/1/3/4/6/134611270/5808833.pdfIn PDF document text
    • https://ludutuwe.weebly.com/uploads/1/3/4/6/134687162/xazuwusetexatujal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_b5eda0b207ce458d8f324c46510a6f38.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c31d5f6c-e322-4ca8-913a-e8f0a4dd179b/brief_applied_calculus_12th_edition.pdfIn PDF document text
    • https://aa6eca1a-c690-4a36-985e-a873157a80b3.filesusr.com/ugd/081493_f6e7f9b16ac449b096cc72a0746e1cef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/143a3dc6-263d-4b6f-9458-553ac5428290/15769865335.pdfIn PDF document text
    • http://nujajixunagiweb.epizy.com/gidagomenojalusugitarewas.pdfIn PDF document text
    • http://niwidek.epizy.com/95339820221.pdfIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_eb159b4d175d47ca95ab1902a3783fc7.pdf?index=trueIn PDF document text
    • https://cf587a47-7c2f-4f55-8bbb-21a4c73503f7.filesusr.com/ugd/8ea597_e7f4ac522f4c40c1b2524bbeb97fe8e8.pdf?index=trueIn PDF document text
    • http://bepizokebador.epizy.com/brain_dead_full_movie_hd.pdfIn PDF document text
    • https://4900ecec-7ac1-411c-be2c-b077674085c8.filesusr.com/ugd/493135_4f2a21fe3e4e4c0aa0453d9266b3efa5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5874349-4761-4686-bec2-b9cba9d01031/school_of_natural_healing_book_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/261bdd2c-eb61-4478-8a20-60b9fb21980e/simeguzagifabav.pdfIn PDF document text
    • http://fisafowuvugedug.rf.gd/90554420737.pdfIn PDF document text
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_e04a4364e58644aca226fdb156a3291b.pdf?index=trueIn PDF document text
    • http://wusutinewipus.epizy.com/mewewigitolojon.pdfIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_1fa0863fef964befa0f601ec82c68456.pdf?index=trueIn PDF document text
    • http://kopupukev.rf.gd/24326456304.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eb7b15c-73ab-4067-a72d-2313de72358f/black_and_decker_drill_bit_set_how_to_use.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_off0000fd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD48 4796 bytes
SHA-256: 7709b5bac80d2f360fc42402c926676236d13dbe2563ac187ba136fe7e7f6d56
font_01_sfnt_off00010dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCA 11532 bytes
SHA-256: 3a831cf00e4ecc10b83c8d8bf405ac9712628f07fbf01c0c1ba08f84eb75ca49

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