Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b786e46e9f5f36…

MALICIOUS

PDF

75.8 KB Created: 2021-05-13 22:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 27bd6876d270a845117b008c387486bf SHA-1: a9c7c764ab0fc4a18e87177e0cdd2ab99a4966b4 SHA-256: b8b786e46e9f5f3604e6a65e5c80dd81df4de7e5ea8003d4a370d49cd1906d49
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a lure related to "Wordly wise 3000 book 11 answer key lesson 3" and hosts a link farm of external PDFs. The primary malicious URL identified is jumiwimov.ru, which is likely used to distribute a second-stage payload. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://jumiwimov.ru/strik?utm_term=wordly+wise+3000+book+11+answer+key+lesson+3 PDF link annotation
    • https://juwarojolajekol.weebly.com/uploads/1/3/4/1/134108785/gevowo_duter_fisepoga_sobulobodolov.pdfIn PDF document text
    • https://guvoruba.weebly.com/uploads/1/3/4/7/134742814/mopogidisigu.pdfIn PDF document text
    • https://pudukodup.weebly.com/uploads/1/3/1/4/131407572/2569036.pdfIn PDF document text
    • http://vududodudo.22web.org/treatment_of_psychiatric_disorders.pdfIn PDF document text
    • http://solokovalafewo.iblogger.org/27156664645.pdfIn PDF document text
    • https://juzajepilokak.weebly.com/uploads/1/3/4/6/134682244/fedabitorep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6c403777-3bdb-430d-a4ca-23d5788374d5.filesusr.com/ugd/e0034b_d42a2073fe8844f18ed772bad41da9f4.pdf?index=trueIn PDF document text
    • http://vameberimonon.onlinewebshop.net/60811373029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d919a24c-fa61-4da0-a8a5-8aab41f00b5e/nikon_d5100_video_mode_tutorial.pdfIn PDF document text
    • http://fodabobaxuti.epizy.com/wudomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00026d24-5105-4986-919f-d20314c81c41/14263569554.pdfIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_476bff34ea994859af83fcade83e1cd5.pdf?index=trueIn PDF document text
    • http://masovuv.rf.gd/amino_acids_structure_and_function.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c2597d3-e4ba-492b-8cea-194209430af4/jozoxajuwonoremexegozagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a4db8c0-dd5d-4a28-9ac5-08502e387a2a/how_do_i_pair_my_xfinity_xr2_remote_to_my_tv.pdfIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_700eb3d36e8b48e399f6937ac6c23c88.pdf?index=trueIn PDF document text
    • http://tudugir.atwebpages.com/autobiographical_books.pdfIn PDF document text
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_01240534ca12494c83737d777d956df5.pdf?index=trueIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_435e2a7a10aa49f0874723633ab7d93d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dca88c8e-13b7-49f4-8248-384641bac7e6/bazokenewenubigixagomebi.pdfIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_f48ed00c72974508948a9fd0dfd44174.pdf?index=trueIn PDF document text
    • http://wegamaluperetuj.atwebpages.com/55575153921.pdfIn PDF document text
    • http://gimukukuzape.epizy.com/night_shift_brewing_santilli_ipa.pdfIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_21ab0e0cd1f246a39f6dee060ea68877.pdf?index=trueIn PDF document text
    • https://4b3c1411-62fe-4b74-ac0d-dad8ff5dd90a.filesusr.com/ugd/d10829_d272d7ffa6284f659e7c5e67cce67cf6.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_off0000e9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A9 5588 bytes
SHA-256: a6c38982c77c99abe5726ef13d5e8d06e19f27e1b3c5e6b32eafaaa0d5f10416
font_01_sfnt_off0000fcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD7 10668 bytes
SHA-256: 9d8387d692eb88c45c531341d8407ce2a01414f7887eae2f85845f81f4997230

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