Malicious PDF — malware analysis report

Static analysis result for SHA-256 959cbf11fdf5f2c2…

MALICIOUS

PDF

94.2 KB Created: 2021-05-30 05:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f17be6102776a03a75cd3589f8b3f003 SHA-1: 2e8aba63e5eeb2ff3e7757884a002fc42b419f18 SHA-256: 959cbf11fdf5f2c29aa14587d2b3e238030c6846bee06a8bb96e443300131d83
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/123?utm_term=pt+sans+caption+font PDF link annotation
    • https://mekebibarefuj.weebly.com/uploads/1/3/5/3/135335096/fedilege.pdfIn PDF document text
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/rimesuvesuza.pdfIn PDF document text
    • https://suvedezu.weebly.com/uploads/1/3/1/3/131379937/guzuleva.pdfIn PDF document text
    • https://jeluxipofike.weebly.com/uploads/1/3/4/4/134490416/paxelixetilokom-gorerajum-jiwad.pdfIn PDF document text
    • https://xixotileko.weebly.com/uploads/1/3/4/0/134018517/cc85a33e79d17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444369/normal_602162d915cad.pdfIn PDF document text
    • https://lewejasolon.weebly.com/uploads/1/3/1/4/131437246/bakinige-xesafe-nowegiseguraw.pdfIn PDF document text
    • https://kapojisu.weebly.com/uploads/1/3/2/6/132696117/3729cc96.pdfIn PDF document text
    • https://fuxarudoniw.weebly.com/uploads/1/3/5/3/135350341/d633c810f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453902/normal_5fe54513d7724.pdfIn PDF document text
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/bivoziwexozupo.pdfIn PDF document text
    • https://dowezepuxaku.weebly.com/uploads/1/3/4/4/134463959/cff273b9e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457305/normal_603962910c649.pdfIn PDF document text
    • https://fuwodeku.weebly.com/uploads/1/3/6/0/136095673/716dd3836ff7e0.pdfIn PDF document text
    • https://guzesunidami.weebly.com/uploads/1/3/0/8/130873942/napivededos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490365/normal_5ffeaa16e9540.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393631/normal_606c69b09375a.pdfIn PDF document text
    • https://nodajalij.weebly.com/uploads/1/3/5/9/135990600/1408784.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f435e442-5746-4c54-8766-d9a75968816a/21895047774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75f0422b-c9b6-48ab-ad98-72c12c1f791d/are_cabelas_pellet_grills_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/853a9328-bb52-4420-8e1d-37f142ffcf37/ocarina_of_time_remake_switch_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24810d8f-c0df-4601-b8c3-85b799d99368/vibanonaxiliwodaledip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dad501e9-b7a6-40f0-bcf6-54b00d4b295f/ladoxosisasedifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d18f6193-7e26-4685-8a87-fb1b6f787229/percy_jackson__the_olympians_the_lightning_thief_2010_full_movie_in_hindi_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3166f8b0-3a0e-4818-b59e-c3f022314453/how_to_live_healthier_lifestyle.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_off00010a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A76 4880 bytes
SHA-256: bb4f04eded443201157ad3b60eb4dd29008dd55ed1c1d4283117e987c7d5b99f
font_01_sfnt_off00011b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2D 31472 bytes
SHA-256: 9c403f38d64b130a2b7508468f08d1daa7c8abda3de4cea3112ec9c5df073530