Malicious PDF — malware analysis report

Static analysis result for SHA-256 de82c8c06000dde0…

MALICIOUS

PDF

74.5 KB Created: 2021-03-22 01:31:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: ade5dbaec2debb23061b21ba4ef352de SHA-1: 2002bff932f317130c010a5e3627cade88cbd7db SHA-256: de82c8c06000dde06da058853721b130ce7d623aec1ff77fe5f2e44f3b98fe9c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least two pointing to suspicious domains ('jottigo.ru' and 'scienceontheweb.net'), suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jottigo.ru/wix?keyword=weather+station+model+worksheet+answers PDF link annotation
    • http://vanimerukaguto.scienceontheweb.net/fuwezudizatamekulop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368972/normal_5ffc83c6cc71a.pdfIn PDF document text
    • http://susurrus.space/trip_bucket_list_app54qcj.pdfIn PDF document text
    • https://kijaxupujik.weebly.com/uploads/1/3/2/6/132695195/wivujuzarul-zawukenitigowej-vomofu-gemeni.pdfIn PDF document text
    • http://safetymirrors.xyz/75225671576p6i32.pdfIn PDF document text
    • http://retys.fun/by_water_and_the_spirit_umcm9bxn.pdfIn PDF document text
    • http://cosmeteca.com/what_does_the_term_arab_spring_meand5s2h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504791/normal_600d8ca2bbe78.pdfIn PDF document text
    • https://sutafufig.weebly.com/uploads/1/3/4/4/134402916/9436348.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390350/normal_600ae644add76.pdfIn PDF document text
    • https://viwekaxirudadax.weebly.com/uploads/1/3/4/7/134700275/461f2ee2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412403/normal_5fefdf2e7f2f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/gotowija.pdfIn PDF document text
    • http://lawiferow.myartsonline.com/8100019790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae7378d7-3b20-4b0f-bd2e-420aa8f62706/45201969077.pdfIn PDF document text
    • http://kubomefewofumim.atwebpages.com/aircraft_seat_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/666576aa-5f49-4361-bb7d-6f7f234cf9dc/45475910998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/715fe4ba-fe6a-4745-be75-675054da26a9/differentiate_centrifugal_and_centripetal_force.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/feram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49729a1d-086d-43a1-89b1-e9dbe53c6034/30647153717.pdfIn PDF document text
    • http://rodedewezijore.atwebpages.com/repulomaxajeraguvekoputaw.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_off0000e614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE614 5232 bytes
SHA-256: 683692bfcfbc1ae247d57c2d7a60d8a76ae22303359e43daca1216c6e1034bd3
font_01_sfnt_off0000f7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CB 10916 bytes
SHA-256: 74e4680867cf39c993a3b64078d801059fdcbbc4e73fa1c969f18617fdd6016a

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