Malicious PDF — malware analysis report

Static analysis result for SHA-256 d998c0ea8a89c4f0…

MALICIOUS

PDF

82.1 KB Created: 2021-03-19 10:12:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8fee2969fca8b6783dd5b619a2348259 SHA-1: b5e0d5b9b704eee846b14b64a0a3006a3ac53753 SHA-256: d998c0ea8a89c4f0c76f6e44abd89716cfce176bf1f745bca168f688b7f34797
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF contains a significant number of external links, identified as a link farm. The ML classifier strongly indicates maliciousness, and the presence of multiple unknown reputation URLs suggests a potential for redirection to malicious content or phishing sites. The document body is heavily obfuscated and unreadable, providing no further context on its specific intent beyond the link farm.

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://druttle.ru/aws?utm_term=the+grape+cure+reviews PDF link annotation
    • http://zotagur.22web.org/foods_to_avoid_with_gout.pdfIn PDF document text
    • http://instapriz.site/574491268337g49m.pdfIn PDF document text
    • http://b2b-servis.ru/can_you_use_a_gopro_hero_3_as_a_webcammzvfl.pdfIn PDF document text
    • http://bbcua.site/how_to_rekey_a_new_schlage_lockrjeuc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387711/normal_6015f102b1417.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/lagakiluvejaxo_semudufoke.pdfIn PDF document text
    • https://labifunuvi.weebly.com/uploads/1/3/4/8/134847398/2710135.pdfIn PDF document text
    • https://fonekukiko.weebly.com/uploads/1/3/5/3/135393218/nutopulopezosep_voxinuxusadawep_satoliwu_suvobijipaxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408871/normal_5fe778b10713c.pdfIn PDF document text
    • https://zipuboxovasabe.weebly.com/uploads/1/3/1/4/131483293/lisolura-fatorotoda-towexaxurik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423714/normal_5ff000e86be3a.pdfIn PDF document text
    • https://nugiwilog.weebly.com/uploads/1/3/1/3/131384260/luzapizujunavasabine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448718/normal_60209e0f923b7.pdfIn PDF document text
    • http://avtoshkola-region26.ru/army_list_builder_40k_8th65u4p.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
    • https://uploads.strikinglycdn.com/files/cf4cb258-b172-485c-81b5-89206f7622b8/toxajoribunanike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/895131fd-5aaa-4df8-b79f-3dbf79c35951/vajafikubovogufefover.pdfIn PDF document text
    • http://wedizakur.epizy.com/fixer_alt_balaji_series.pdfIn PDF document text
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_ef24cdd637bc44e4b4095b0bd6d036b6.pdf?index=trueIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_3c6c71dfd943485688e2e94b728c6590.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_034fb64b16db426a9ef1566e9f1a5a0f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eaf044a-1014-40e5-abb9-7159f6a0c917/portrait_photo_tips_and_tricks.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_off0000f617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 4848 bytes
SHA-256: 51bf1fd4c9c8709211c57d4f2e274f67b86174d6480e13e9a51bc9985ba84997
font_01_sfnt_off000106bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BD 11332 bytes
SHA-256: 26fed1c5acabd0e1c18d2140d47ec870731eeb424689fc0bfad94d1b408043a8
font_02_sfnt_off00012d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D17 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2