PDF malware analysis — malicious · cc64432691d406a3

MALICIOUS

PDF

79.4 KB Created: 2021-06-12 07:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18

MD5: 7990ed13c98d9872c33f6e872af439d1 SHA-1: bb5a1993881417cb459076aaff92ef8fbdcb80f8 SHA-256: cc64432691d406a3597b83481ba25fde0d18bfef947b49e005fbd31addb9cc51

126 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, indicating a phishing or trojan payload. It contains numerous embedded URLs, with a primary suspicious URL being https://archism.ru/pbw?utm_term=times+table+work. The document body, though heavily obfuscated, suggests a lure related to 'Times table work'. The presence of multiple external URIs and the link farm heuristic suggest an attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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
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://archism.ru/pbw?utm_term=times+table+work PDF link annotation
- https://cdn-cms.f-static.net/uploads/4426407/normal_5fe8d74709a52.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366024/normal_60b9cea0a4a32.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4455894/normal_60644848298b0.pdfIn PDF document text
- https://difivumubum.weebly.com/uploads/1/3/4/5/134577496/duruwoliwedasug_kanunujed_viwagetefotixut_belufozugiko.pdfIn PDF document text
- https://degexaxi.weebly.com/uploads/1/3/1/4/131406510/borelodin_bowejupaxav.pdfIn PDF document text
- https://kuwavumiwedow.weebly.com/uploads/1/3/4/6/134673312/kabap.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4408319/normal_604d2d2b82c9f.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://povelin.pbworks.com/w/file/fetch/144888534/new_pubg_mod_apk.pdfIn PDF document text
- http://gemometis.pbworks.com/w/file/fetch/144513189/kotiveniwalakogeda.pdfIn PDF document text
- http://gatasulupu.pbworks.com/w/file/fetch/144716334/17825086819.pdfIn PDF document text
- http://gozuwef.pbworks.com/w/file/fetch/144703152/mowekewixoletibowazipujo.pdfIn PDF document text
- http://luwivaj.pbworks.com/w/file/fetch/144723414/anti_terrorist_squad_mod_apk_download.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/a95626d2-6ecb-4675-8a3c-bd4c9cc87167/mebigukuzijede.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/0dea23c7-632a-46c7-83c4-2c1acb2844fa/60470595495.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/79e84b52-9922-4d2b-a0f3-64c7315c5e0d/fender_mustang_gt40_amp_manual.pdfIn PDF document text
- http://furalagaposu.pbworks.com/w/file/fetch/144598569/how_do_i_contact_american_express_travel.pdfIn PDF document text
- http://jolunatimavu.pbworks.com/f/fimuzowaxemaza.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f7059fc5-089b-4139-9048-0f0662be2068/how_to_write_literary_analysis_thesis.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/a2856591-ae3c-4616-b97f-c36ddc6f9e1f/lofamikubosezuku.pdfIn PDF document text
- http://juxivos.pbworks.com/w/file/fetch/144799737/36615077146.pdfIn PDF document text
- http://xuvabufoj.pbworks.com/f/how_to_write_up_a_bill_of_sale_for_a_used_car_in_ontario.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ee7c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE7C	4756 bytes
SHA-256: `7e35164b7474c99e8e722dea9db7df5dcfc1e44830324ddaa29e208788f383e7`
`font_01_sfnt_off0000feae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFEAE	10424 bytes
SHA-256: `0e34fa7d0ac0855fca23462f398d18bbe79a6ec562c20a78d7ac647a097fac50`
`font_02_sfnt_off0001225a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1225A	4324 bytes
SHA-256: `d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378`

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