Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1a97933a7835af…

MALICIOUS

PDF

87.1 KB Created: 2021-05-31 04:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a398f2d2e8ebb5c0af1ad7a7e37e82b4 SHA-1: ecef45be5bba6a36f27ae70a5cc497dfc1d94158 SHA-256: 0b1a97933a7835afdf0a1ad83541aa399df0ee026a8340aaf4c3bc7f8806729f
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://xezojetit.ru/123?utm_term=que+es+psicologia+clinica+pdf PDF link annotation
    • https://gugagefa.weebly.com/uploads/1/3/4/3/134343265/2270908.pdfIn PDF document text
    • https://gojefofowuf.weebly.com/uploads/1/3/4/5/134596001/wutawimaka.pdfIn PDF document text
    • https://jaragamonobuwuf.weebly.com/uploads/1/3/5/3/135346236/fewekilefejojefis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500208/normal_5fce84e88168c.pdfIn PDF document text
    • https://gejiraje.weebly.com/uploads/1/3/2/7/132740564/5bd045a.pdfIn PDF document text
    • https://bepirujeli.weebly.com/uploads/1/3/1/8/131856565/1080175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370996/normal_603bd04b8f1a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492529/normal_60063393eece8.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4373788/normal_60affc62c9118.pdfIn PDF document text
    • https://rovividupezudu.weebly.com/uploads/1/3/4/3/134373795/zunaputivawul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393044/normal_60220747c84c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444356/normal_600b0b15422e1.pdfIn PDF document text
    • https://fomunova.weebly.com/uploads/1/3/4/6/134684458/2803253.pdfIn PDF document text
    • https://mikatafa.weebly.com/uploads/1/3/1/3/131398449/3427382.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466996/normal_6004ecff109b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446151/normal_60291d9e7038a.pdfIn PDF document text
    • https://sujoxiwu.weebly.com/uploads/1/3/4/8/134879933/xegerip.pdfIn PDF document text
    • https://lebetazukuz.weebly.com/uploads/1/3/1/6/131606644/bomowitit.pdfIn PDF document text
    • https://menudapopejit.weebly.com/uploads/1/3/0/7/130775932/sisidunusalapodu.pdfIn PDF document text
    • https://karopudalel.weebly.com/uploads/1/3/4/8/134881347/d1cf6.pdfIn PDF document text
    • https://muboxofibadufus.weebly.com/uploads/1/3/4/3/134310828/zatixunif.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/05f7b3ca-9c7b-4ec2-b237-a32d2deb41b0/how_to_play_uno_family_card_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d62206e-7e3b-46bd-86e1-f60bcb4f852b/39110547820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78ab01b9-c4ea-4591-93ed-08f8b80ebcb3/peavey_vypyr_vip_3_footswitch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/096e3fbd-f47b-4f09-bbe6-36fe671ac9c5/1507257288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9f930cd-6d87-4d6d-9ff8-485f88b19290/rereralutitel.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_off00011409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11409 5288 bytes
SHA-256: 3c513a98e7902f8e10a40cea694c3d87e6d85b2a0446ae723c4c83ecc2679b9a
font_01_sfnt_off0001261f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261F 12124 bytes
SHA-256: 8766e9217ef2bd93fe2820db47823fdbb4e3ca6ae79716479a340b331d78f90f