Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75e081b85fce6f8…

MALICIOUS

PDF

133.4 KB Created: 2021-04-18 20:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25e3ce09823821a566cdaadcf8c717b1 SHA-1: 824d9dc5c400ae1cd5bdb5b6ce7c4dcd7c8dde4a SHA-256: c75e081b85fce6f8f08a9dc987b14b8ad02d7b6a3d45eb5959171e3b5708eb72
206 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious phishing content. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The document body, though heavily obfuscated, appears to be a lure related to a search function, likely intended to trick users into clicking the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://zajinet.ru/strik?utm_term=how+to+do+a+global+search+on+ipad+home+screen
    • http://jupifidupepir.getenjoyment.net/hadith_bukhari_and_muslim_in_urdu.pdf
    • http://rozogididibusar.sportsontheweb.net/pdf_accelerator_programmes.pdf
    • http://civiliscmq.online/how_to_make_a_simple_dimple_with_cardboard8mz86.pdf
    • http://zibepifutidi.sportsontheweb.net/32807206087.pdf
    • http://tadosuzewamu.medianewsonline.com/shoot_to_thrill_guitar_tab.pdf
    • http://fafikup.scienceontheweb.net/xomezukozevigixaloduv.pdf
    • http://zesegalos.scienceontheweb.net/gagodenogam.pdf
    • http://ital-girl.space/17805225907o71kf.pdf
    • http://texifudosino.mygamesonline.org/can_you_make_homemade_donuts_in_an_air_fryer.pdf
    • http://palitra-cveta.ru/dyson_vacuum_repair_shop_near_meio8lu.pdf
    • http://badge-verification-center.com/how_to_troubleshoot_a_gas_water_heater_thermostatxu41s.pdf
    • http://tezibif.mygamesonline.org/fathers_and_sons_volvo_west_springfield_massachusetts.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_692cace6ad8c4f989cac991140449415.pdf?index=true
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_651f4374de604b2ebce41b853334c7b6.pdf?index=true
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_525a98e7b94040ca9b3a06fceec3ed29.pdf?index=true
    • https://761e60ea-5e0e-4c43-b4c2-f6a9045c608d.filesusr.com/ugd/545033_98265f16621946f388a6c13ac1b6a0ed.pdf?index=true
    • https://s3.amazonaws.com/tazopaju/divak.pdf
    • https://s3.amazonaws.com/vidadaviwal/22644743391.pdf
    • https://s3.amazonaws.com/xedewofuretujo/google_blog_templates.pdf
    • https://s3.amazonaws.com/nuvukivaxiren/what_is_systematic_literature_review.pdf
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_63b6be76708d46e7ad93dcfbb04228dd.pdf?index=true
    • http://jujobope.atwebpages.com/tuwunadi.pdf
    • https://7c3a386c-9197-44ff-a2a0-26a6be1b6260.filesusr.com/ugd/bba797_a9b98e6789e74f7c9c1bea53534d03db.pdf?index=true
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_353319d16af448cdb51077e896c4eab2.pdf?index=true
    • http://xevijojikutep.onlinewebshop.net/45598211855.pdf
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_18ee8337c78f43d8ba35e71a687e825c.pdf?index=true
    • https://s3.amazonaws.com/divikufifir/demolo.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_off0001c89a.bin
8a9f2f08749a527f24a4332e53bfdb82fe38cfb9e0c876e073edc1d580282c37
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C89A 5680 bytes
font_01_sfnt_off0001dbcd.bin
f45da2af1e02b56c418b534fcf1847068793d43dd2f56f7a9e5f55e60920e275
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBCD 12372 bytes