Malicious PDF — malware analysis report

Static analysis result for SHA-256 884de4a08fe6e473…

MALICIOUS

PDF

76.9 KB Created: 2021-03-06 01:51:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e2beb7e6d27510d4681135e0ba39bc4e SHA-1: b0349f81cd96702772bcaf07a63d12b5ddaa5ed4 SHA-256: 884de4a08fe6e47367b0671d3763c2a4bb355a24a14809a8f03c90df13085bb1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One prominent URL, https://mezovuduw.ru/123?utm_term=english+dictionary+app+for+mobile, is presented with a deceptive context related to a dictionary app. While no scripts were explicitly extracted, the PDF structure and extensive link farm activity are indicative of malicious intent, likely to drive traffic to malicious sites or for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/123?utm_term=english+dictionary+app+for+mobile PDF link annotation
    • https://gelupolo.weebly.com/uploads/1/3/5/3/135314506/4750939.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/87839196492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448137/normal_5fd95bcf48d38.pdfIn PDF document text
    • http://faketikus.22web.org/spanish_interrogatives_worksheet_answer_key.pdfIn PDF document text
    • http://ligugiban.scienceontheweb.net/john_deere_lawn_tractor_blades_wont_engage.pdfIn PDF document text
    • http://jefevivavifax.scienceontheweb.net/dekabuzawazopox.pdfIn PDF document text
    • https://kaxalosenawa.weebly.com/uploads/1/3/4/5/134576513/558e4074df2bc.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/coleman_eb15b_electric_furnace_troubleshooting.pdfIn PDF document text
    • https://tewawabuse.weebly.com/uploads/1/3/1/4/131437503/zaradofalel_zixilanusuru.pdfIn PDF document text
    • https://sapilijufidukuw.weebly.com/uploads/1/3/4/9/134901451/5dc8e259a2.pdfIn PDF document text
    • https://kutebebi.weebly.com/uploads/1/3/4/5/134528954/xonefitotakakatuzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500187/normal_60217d041fbec.pdfIn PDF document text
    • http://guvizaw.22web.org/wosuwuronude.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuwedutukuw.epizy.com/65854815756.pdfIn PDF document text
    • http://dejogamolefip.rf.gd/96902692980.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a53bc0c4-74ee-4a8b-ba42-082e988d19d0/nyx_professional_makeup_cant_stop_wont_stop_foundation_swatches.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e4797e2-ba32-4160-b322-fad98a15c968/jalerekujolikudolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/febb7180-1878-4050-906e-de0e2930018b/petsafe_stubborn_dog_wireless_receiver_collar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/147dc1cd-0f49-46f1-941c-307d8f4cb32b/38794902968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a11e6268-7ede-40c3-9105-5333abd191f8/78175035981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c96038b-4b6d-43af-84f1-2605e1e7734f/76685214571.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_off0000ee7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 5768 bytes
SHA-256: 820630154ce3da050be957df7eb8e9eb01673cac8968b9f2fe502df56c331978
font_01_sfnt_off00010208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10208 10412 bytes
SHA-256: 26fb328f198ec7d732b52cf325fc5316ab57a92ebd25b3680e0fe8c316b0e91a

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