Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee8b10adcd8f40b7…

MALICIOUS

PDF

80.6 KB Created: 2021-03-13 17:11:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 136091f9d923e37b4c73bed8c681e00a SHA-1: 21a50e3c43af6c4643c4571527e7f59f23dc11f1 SHA-256: ee8b10adcd8f40b7d1454530afdbb5f690c74e0ce4c85da0969060e6eb19961d
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 0.9995

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://nipisod.ru/strik?utm_term=2013+honda+civic+oil+service+reset PDF link annotation
    • https://gefetejumifigo.weebly.com/uploads/1/3/4/6/134688955/3822842.pdfIn PDF document text
    • https://vumusubivabup.weebly.com/uploads/1/3/4/4/134491869/29f4917bc88373.pdfIn PDF document text
    • http://ponezivugatub.22web.org/mokulupamopigixirivome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410020/normal_6013cb87d7e68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408186/normal_604313a2647d8.pdfIn PDF document text
    • https://buminezavo.weebly.com/uploads/1/3/4/6/134650892/refet.pdfIn PDF document text
    • http://legalevi.22web.org/9th_std_tamil_guide_free.pdfIn PDF document text
    • https://maritomumotoko.weebly.com/uploads/1/3/4/5/134512683/bufigulisotubep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404965/normal_601efc92263a2.pdfIn PDF document text
    • https://gegefajowib.weebly.com/uploads/1/3/1/3/131380265/991652108e.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://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_6713ac0707174e4cbbab0ea8c4e13680.pdf?index=trueIn PDF document text
    • https://7980b0ff-2efe-48f4-a442-6c87bca80713.filesusr.com/ugd/9bd8c3_060ee8675a924e09b8db42871630a6db.pdf?index=trueIn PDF document text
    • http://motatowavem.epizy.com/vamebugixifujugofazud.pdfIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_65ed0db036004ef7810e2ff7cd225fee.pdf?index=trueIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_c20092e16f434809bc407293904a7f65.pdf?index=trueIn PDF document text
    • http://vevosewis.rf.gd/kalesavigugivugakagud.pdfIn PDF document text
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_2c8f4d8785d746a7a603630888851d2f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/features_of_a_spreadsheet_application.pdfIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_45b24a246cf84c318a7b879f253a203b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/pubg_xbox_one_aimbot.pdfIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_08fa08f9d979495fab0999363923568e.pdf?index=trueIn PDF document text
    • http://binasizula.rf.gd/vafixaxajupaza.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8C 5268 bytes
SHA-256: 5167f15c2eac281548729560b0eaa25528de11afab6965e22777fb1d0b3ad93a
font_01_sfnt_off0001015e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015E 10908 bytes
SHA-256: 56489ad9971ed7f61ba7b0912a06d9ec3eac86ecc331b69970205ac2452eaa37
font_02_sfnt_off0001268a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176