Malicious PDF — malware analysis report

Static analysis result for SHA-256 440be64a04726fbf…

MALICIOUS

PDF

79.7 KB Created: 2021-03-16 15:53:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 419b27feb722f73db19f80377bd8f471 SHA-1: a84d77d3dcc3b2abc20eadacf7b472c284feb974 SHA-256: 440be64a04726fbf46dde8451faee07561bbb842ebf537185d594518b77321bb
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with a primary URL pointing to 'seumenha.ru'. Heuristics indicate a high likelihood of malicious intent, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to potentially malicious sites or for SEO manipulation. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/strik?utm_term=125cc+pit+bike+engine+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406169/normal_602c89eb7d8ae.pdfIn PDF document text
    • http://carinsusa.info/2005_caravan_3.3_oil_capacityvsttn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391302/normal_5fd8e9786e5b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471971/normal_602d83dda150c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501989/normal_6049ddc43ff7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478923/normal_6023e09563ffa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468871/normal_5fe8db81eca7c.pdfIn PDF document text
    • http://ijmalan.xyz/89769368281332sp.pdfIn PDF document text
    • https://sujepofuk.weebly.com/uploads/1/3/0/7/130775011/diduwutawopilaso.pdfIn PDF document text
    • http://nely.xyz/lufewameveranuwunaputixanbbzrq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426087/normal_5fc6469ecb016.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383450/normal_5ff41f09ec969.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458623/normal_5ffb6ae1df7cd.pdfIn PDF document text
    • https://dapalijika.weebly.com/uploads/1/3/0/7/130738969/0537eb.pdfIn PDF document text
    • http://smotrikino.fun/busiwibimakanawekimakok03b.pdfIn PDF document text
    • http://shoppingyxplus.xyz/subizukcotty.pdfIn PDF document text
    • https://sokuvefababadax.weebly.com/uploads/1/3/1/8/131856373/3019266.pdfIn PDF document text
    • https://xularidamilizal.weebly.com/uploads/1/3/4/6/134685918/kuwevuj_wisivaziv_sirajuluvo.pdfIn PDF document text
    • https://dikanutedageke.weebly.com/uploads/1/3/4/4/134457663/gelodejigivepuz-gikukifadabeguj-redibuda-bofuzoravexu.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://jumametewarad.rf.gd/storyboarding_software_free.pdfIn PDF document text
    • http://jiporeve.epizy.com/kufajolixutolevudizufij.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/dyson_dc39_exhaust_filter_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/motorola_talkabout_manual_t5700.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_off0000ed5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 5164 bytes
SHA-256: 078fc6ebab4ff636f8d847fc3155d061f7d114d2dc44e29c3ad8f940a8641c6d
font_01_sfnt_off0000fee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE9 10784 bytes
SHA-256: 803231d3bec12f8980ff5e53a43cb0672955fc7dd0b29f394fec44bd92ce198a
font_02_sfnt_off00012390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12390 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378