Malicious PDF — malware analysis report

Static analysis result for SHA-256 459750a5f83d51bb…

MALICIOUS

PDF

75.0 KB Created: 2021-05-18 19:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b53df23704b61a14d9f91b181eb01d6 SHA-1: 70c6b025bf2a432465760f3415063f41b4f542a4 SHA-256: 459750a5f83d51bbfb7e59e50236e6d69f075c96da50d1bb26609674f090b3b9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and employing UTM parameters, indicative of a link farm for SEO manipulation or to host phishing lures. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself facilitates the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://leonvi.ru/strik?utm_term=what+do+numbers+1231+mean
    • https://tusemebi.weebly.com/uploads/1/3/4/3/134316443/2700147.pdf
    • https://tevufipe.weebly.com/uploads/1/3/1/6/131606546/warate-naxigovot-roketodob.pdf
    • https://kigodebilak.weebly.com/uploads/1/3/5/2/135297846/nifivevupubuk.pdf
    • https://pigumetazemebet.weebly.com/uploads/1/3/0/7/130775485/zajik.pdf
    • https://jadipiruw.weebly.com/uploads/1/3/0/8/130814676/6dd4185402fa13.pdf
    • http://tusukezilineji.66ghz.com/meal_voucher_template_free.pdf
    • https://fogasofimoxor.weebly.com/uploads/1/3/1/0/131071298/bugawenitokofot.pdf
    • https://sukifife.weebly.com/uploads/1/3/4/3/134334287/5221491.pdf
    • https://mewodufupojapoz.weebly.com/uploads/1/3/1/8/131857890/ae57af4533616be.pdf
    • https://bagawilikazukir.weebly.com/uploads/1/3/1/0/131070307/jutuwasimiwi_gibokada_tesex.pdf
    • https://duvozeja.weebly.com/uploads/1/3/0/7/130739152/wifunopevawape-tidekusereza.pdf
    • https://xalanuxezofoki.weebly.com/uploads/1/3/4/3/134309931/995c70eaf8cc.pdf
    • https://zumikifekov.weebly.com/uploads/1/3/0/8/130813997/1973816.pdf
    • http://vitogap.22web.org/siwudajufezuraxavepu.pdf
    • http://xebobimifu.22web.org/online_converter_scan_to_excel.pdf
    • https://jisawawaxiwibes.weebly.com/uploads/1/3/1/6/131606947/mafako-roxipig.pdf
    • https://kenodijegubiv.weebly.com/uploads/1/3/4/5/134501598/laleketojotowilu.pdf
    • https://gufagopa.weebly.com/uploads/1/3/4/6/134660265/segivewuloxefav.pdf
    • https://xodimazu.weebly.com/uploads/1/3/1/4/131408168/ladesavivesofid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1301cf5f-36a5-4abb-a11d-a38771e661e1/dobozukebemodizabew.pdf
    • https://uploads.strikinglycdn.com/files/6a033816-17fb-426d-808d-66a807052331/72430658404.pdf
    • https://uploads.strikinglycdn.com/files/acd19801-db74-4c93-87f7-c5d611e9f56b/zojapef.pdf
    • http://zimifad.epizy.com/92207979703.pdf
    • https://uploads.strikinglycdn.com/files/bbc5c84d-cdd0-48a5-943a-9514eb1b9df6/free_month_to_month_room_rental_agreement_california.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e84b.bin
0aa5e307b7d3558564fd731f019d768c5f3cfe2131fb9875fa118f23e8d3af3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 5536 bytes
font_01_sfnt_off0000fafd.bin
1b2b2753a7a77628cce705f1f61af2e04224662b44a7732f1b7577ebbfccf984		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 10468 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.