Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d97e9c4bd7d2b1…

MALICIOUS

PDF

87.1 KB Created: 2021-04-01 12:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3b545765d2189ef193b28cabb2cddbaa SHA-1: c5fa2fb816d246bc3bc5923d9124b3af48d894d7 SHA-256: d4d97e9c4bd7d2b1293ade382e64fcb8fc96cfb96a5aa6fb5036d148097010c0
126 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, and is flagged by heuristics as a link farm designed for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://pelibifir.ru/award?keyword=2020+marathi+calendar+pdf+free+download PDF link annotation
    • https://dopakujovifoba.weebly.com/uploads/1/3/0/7/130739833/065f5cd0499a711.pdfIn PDF document text
    • http://extrameets.fun/what_is_the_meaning_of_english_as_a_second_languagedtusl.pdfIn PDF document text
    • https://komidozikozapuf.weebly.com/uploads/1/3/1/4/131455883/milajarudawim_luligizixukijo.pdfIn PDF document text
    • http://goproonly.com/2939139827135m47.pdfIn PDF document text
    • http://daimontimur.org/jetuzewumumijam4kbmx.pdfIn PDF document text
    • https://kanevedodusuwa.weebly.com/uploads/1/3/0/8/130814441/dagewuzigip.pdfIn PDF document text
    • https://zuvopiramalatug.weebly.com/uploads/1/3/5/9/135981479/6d97cc82eb3d8.pdfIn PDF document text
    • https://wisetigu.weebly.com/uploads/1/3/4/3/134357320/634675.pdfIn PDF document text
    • https://fupewipi.weebly.com/uploads/1/3/6/0/136091895/5047c0c57d3.pdfIn PDF document text
    • http://maslovauto.ru/ver_el_tipo_de_archivo_en_linuxbbe4j.pdfIn PDF document text
    • http://hookup666.site/cowboy_costume_boy_diysqz11.pdfIn PDF document text
    • http://chambreapp.xyz/524711382210wnk2.pdfIn PDF document text
    • http://extrameets.fun/why_does_my_viper_remote_start_not_workox089.pdfIn PDF document text
    • http://bettermoneytips.com/jafisikozuvujanupbcj.pdfIn PDF document text
    • https://najusijas.weebly.com/uploads/1/3/5/4/135400897/6875475.pdfIn PDF document text
    • http://uablog.website/gledai_filmi_online_7ievjk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_7d76e3ceda7246209ae7667d5ae85204.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9bf16ab-e596-4cc3-a91e-a257be773024/33529582986.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09af5725-096e-4598-add3-13d74b52d4a5/legadotamosiwik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b8b0b49-e319-4a4a-b4e7-af1a8e06e4f9/poulan_pro_backpack_blower_carb_adjustment.pdfIn PDF document text
    • https://29fa80ab-3b21-46a5-a5c9-66d7a3d84e9c.filesusr.com/ugd/eb9fb8_7bd92f182c584fc88ac78f5dbd8bb423.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb0397cd-fe91-4947-a31d-7adc107663a6/can_blood_type_a_eat_popcorn.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 5488 bytes
SHA-256: 2d7d713b804476e2033862b849ac62041d875f57e1d104e9f03fa687bd68c828
font_01_sfnt_off0000fc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC26 11092 bytes
SHA-256: d8dba93afc818f67f1ef8c962ef38bc4b6b8818aa19b39d891a0da3aaf99d70d
font_02_sfnt_off0001218e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218E 16172 bytes
SHA-256: 461a1578f80084b2f2ca998a6e716936969cc9b33b2976d66eaaa57f6abee57a
font_03_sfnt_off000136e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E7 6668 bytes
SHA-256: bb6e7fc8bfed9dd7ad41bc622a772ffce12c415ba74a84d7b6a52eb7e60cd201