Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55b7c1db624d64c…

MALICIOUS

PDF

130.1 KB Created: 2021-03-13 17:16:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4f6e7d4b98cb1a2d314c10e8c379af2a SHA-1: 2ad29b1e3d9e5b0b3cc8934d79c8b217ad35e572 SHA-256: c55b7c1db624d64cbebd810d16bf40da4dfe085dcb6b7770b377caabcba2d81c
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external PDF files hosted on various domains, including disposable ones. The primary lure appears to be a search result for "who is the lead character in les miserables", which redirects to a URL containing a UTM term with the same query. The presence of ClamAV detection and ML flagging indicates a high likelihood of malicious intent, likely to distribute further malware or phishing content through the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://fokemale.ru/strik?utm_term=who+is+the+lead+character+in+les+miserables PDF link annotation
    • https://cdn.sqhk.co/joninopi/kdVigZG/dragon_hunter_lance_max_hit_osrs.pdfIn PDF document text
    • https://zinegekoxemajaj.weebly.com/uploads/1/3/4/7/134767253/vobaf.pdfIn PDF document text
    • https://wapolamezabez.weebly.com/uploads/1/3/4/0/134041225/8874000.pdfIn PDF document text
    • https://cdn.sqhk.co/pipidopowewe/iehdiiF/top_10_selling_singles_of_the_70s.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/JOtTrij/38960633575.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/eghQ9Cb/22253743756.pdfIn PDF document text
    • https://cdn.sqhk.co/rugofufol/hhbDRgd/truck_upholstery_shop.pdfIn PDF document text
    • https://cdn.sqhk.co/fakodozug/lBhcjc7/xojarijuwakozakasulexutob.pdfIn PDF document text
    • https://kazenoti.weebly.com/uploads/1/3/2/7/132740362/pufesipomujegudo.pdfIn PDF document text
    • https://lelazasizegaki.weebly.com/uploads/1/3/4/4/134491428/pizobilebiz.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/1jbUiim/59571257438.pdfIn PDF document text
    • https://cdn.sqhk.co/nufomewo/2iib1Io/35118981104.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxikinanibu/ghkhimV/60263581406.pdfIn PDF document text
    • https://bozaxemavokasum.weebly.com/uploads/1/3/1/3/131383719/waseramif.pdfIn PDF document text
    • https://cdn.sqhk.co/karadirimose/fiaAKgc/42446918830.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/irhiFgn/free_offline_games_for_iphone_4s.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/f115b923-63bd-4a68-b2b4-797c8f638545/13373373319.pdfIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_d8aa677a85fe4576bc32c193d9b72d3c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/536bae49-e7d1-4bb4-90c9-c50f1f9196a3/68460157759.pdfIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_f4fdd7e449584af3a2e709eada47747d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5da9b096-1305-45d2-92bb-69c07cab7323/how_to_play_minor_notes_on_bass_guitar.pdfIn PDF document text
    • https://0b609444-e5a2-4a7e-9779-a3c6bae51a53.filesusr.com/ugd/529dbf_5f17446333564051927d1779e610c7c6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a238805b-06cb-441b-9ee3-ec93308c80c9/mulelugaduw.pdfIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_2a583853d5114b82add894701a78a5ed.pdf?index=trueIn 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_off0001b1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1D1 5120 bytes
SHA-256: e023f6d30175a47ee654c268a209da6704ae8caafbbd998111093cdf4d88efed
font_01_sfnt_off0001c308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C308 12224 bytes
SHA-256: 7d05cc29e25acd47c52a5d27322c8e30b341373a24d39ff9107d542c6fc93bab
font_02_sfnt_off0001ec11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC11 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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