Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c5bba016747ede…

MALICIOUS

PDF

77.9 KB Created: 2021-03-25 03:02:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c1b4a4d093bb7d38553143ba0cb85826 SHA-1: 287c87a4c8e502471e91861e81bebf2fa0490813 SHA-256: 71c5bba016747ede4c126fb770c4abff248376ac5166dc1c67c983da85f88c30
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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 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://zajinet.ru/strik?utm_term=craftsman+10+inch+table+saw+dado+blade PDF link annotation
    • http://fasekafalig.scienceontheweb.net/data_science_degree_purdue.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407788/normal_5fe0fde11d957.pdfIn PDF document text
    • https://babixedijifaz.weebly.com/uploads/1/3/5/3/135385025/zadejilefol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366381/normal_5fefc83b1dd34.pdfIn PDF document text
    • https://posenumu.weebly.com/uploads/1/3/0/7/130776111/faa6b873.pdfIn PDF document text
    • https://cdn.sqhk.co/zifuvifiweva/aAtgnx6/best_online_shopping_apps_usa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409113/normal_6014ff18816f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489976/normal_602076b66791a.pdfIn PDF document text
    • https://pudijeda.weebly.com/uploads/1/3/4/5/134586696/siratawas.pdfIn PDF document text
    • http://wozekozexufoxol.scienceontheweb.net/how_to_figure_out_friction_loss_in_fire_hose.pdfIn PDF document text
    • https://cdn.sqhk.co/werutojij/g3aigjh/25625802974.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408323/normal_600bffba465bf.pdfIn PDF document text
    • https://bizudabug.weebly.com/uploads/1/3/4/7/134722823/rewezo-xolofekidu.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/4geighb/guilty_crown_season_2_plot.pdfIn PDF document text
    • https://cdn.sqhk.co/bomagomax/CR3hdhd/pixel_art_maker_unblocked.pdfIn PDF document text
    • http://nujijaj.getenjoyment.net/muwapozufedik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_abcb2822cece45ce8c27ac72ce9c9cbc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2fbdec4-e239-41e0-a4e4-145b92d44066/20695082837.pdfIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_bcf8bfb7ccd74284b827bb47bdf60611.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2930a8e1-5781-4c9c-83a8-8f9e08625cb3/57263375884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b61ae921-d093-4030-943e-7cbe1b556097/57946816461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38b86ba5-eb29-41ce-81c6-a00a42846c19/is_the_star_of_bethlehem_going_to_shine_on_december_21st.pdfIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_7547ed1dbb5f4b938d0a87bbfcde2b45.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d336ac-9788-4ba8-85e0-4b542f774818/kidexo.pdfIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_a83a6f8ce803409fb6436805db1de439.pdf?index=trueIn PDF document text
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_989e0419456a421eb1f7daa40c71de28.pdf?index=trueIn PDF document text
    • http://sanugifop.atwebpages.com/what_is_the_theme_or_message_of_the_gettysburg_address.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_off0000f1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B8 5592 bytes
SHA-256: 6e4bec55304481fcb46d0be94ff92dcad7d076bec8a1041bc81480d5c0575b88
font_01_sfnt_off000104a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A1 10964 bytes
SHA-256: 0fb48a08b57b98c759bfe1ea1358b24f67a256a89e5be2a67683d2cfd35be265