Malicious PDF — malware analysis report

Static analysis result for SHA-256 67516eb8ead08216…

MALICIOUS

PDF

86.3 KB Created: 2020-12-27 02:43:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 615f6e3d75d5b5025b3a49d9ef4080dc SHA-1: b3940a34bf2ef0e1015f00669c6000f58dc22907 SHA-256: 67516eb8ead08216b3bb751ff16fa57121c0f8e60a20d2af13d2bee395e471d9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The embedded URLs and the nature of the heuristics point towards a phishing or content distribution scheme rather than direct exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/strik?utm_term=sirocco+definition+world+geography PDF link annotation
    • https://xizejaselaz.weebly.com/uploads/1/3/4/3/134357450/boxarosuboterakij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419623/normal_5fc116493203c.pdfIn PDF document text
    • https://fuvexowigirupog.weebly.com/uploads/1/3/4/8/134896800/8024652.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377679/normal_5fd27cc87d7e7.pdfIn PDF document text
    • https://cdn.sqhk.co/jujirepak/jYhdhhb/strike_fighters_pro_free_download.pdfIn PDF document text
    • https://govubazidexifa.weebly.com/uploads/1/3/4/3/134342639/judalele.pdfIn PDF document text
    • https://xavubetikobu.weebly.com/uploads/1/3/4/4/134474291/tujareganaziw-vujipumun.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/DWhghaH/benubil.pdfIn PDF document text
    • https://rukagevilatixa.weebly.com/uploads/1/3/1/6/131608017/muwumiwifaja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/senior_last_will_and_testament_funny.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47345661-8941-4c4a-8860-a9709d067a46/jifurenubipoxurevimeten.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/rupinder_gandhi_all_song_mr_jatt.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/sobuwilidasut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fa2e5b5-0750-4415-846b-660bd4a7bd5b/mighty_morphin_power_rangers_nes_rom.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C0 5536 bytes
SHA-256: 4f8b4ef0aed7db9244ad71416ae0bf699ffec31c76a5507d22d476a5e13035a6
font_01_sfnt_off000116a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A0 6048 bytes
SHA-256: ba0c8dfa304cf746cf480d6cc74028faa8aa4c3f5270cb86e0c6e9306d50f2c8
font_02_sfnt_off0001264e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264E 11200 bytes
SHA-256: daeb724b222146053f36dbae785ddd1cc5979b85d9db7fbc72f99359e3e20736

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