Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f079f48a3a7f3ec…

MALICIOUS

PDF

74.3 KB Created: 2021-04-03 07:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0293badcec4a1be5a0acf7bcab78907e SHA-1: 425f337cbb99154d4428a964f149b1fbf7509c38 SHA-256: 1f079f48a3a7f3ec1ffd134cf05cd78830224d23570d079ea4a91caff32cf6e9
186 Risk Score

Malware Insights

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

The file was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest it may be used to redirect users to malicious websites or phishing pages, potentially leveraging embedded JavaScript for obfuscation or further redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/award?keyword=farmakologi+amoxicillin+pdf PDF link annotation
    • https://xajomorunineg.weebly.com/uploads/1/3/1/3/131383441/3b886298c1809c6.pdfIn PDF document text
    • http://vimobewawulipiz.mypressonline.com/printable_new_york_subway_map_with_streets.pdfIn PDF document text
    • http://ponaxamewimenul.sportsontheweb.net/antifungal_agents_definition.pdfIn PDF document text
    • http://rodisawikikofu.medianewsonline.com/77014294524.pdfIn PDF document text
    • https://sogitinavebifi.weebly.com/uploads/1/3/5/4/135400198/1a6fd80a.pdfIn PDF document text
    • http://20970907.net/luvogakeviwifegexxgcgf.pdfIn PDF document text
    • http://xepuxesadara.mypressonline.com/tesda_bookkeeping_nc_iii_exam_reviewer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447097/normal_5fe80cb6c26a9.pdfIn PDF document text
    • http://filozajerezabi.getenjoyment.net/consonants_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420438/normal_604f815006f19.pdfIn PDF document text
    • https://rudoliretumuw.weebly.com/uploads/1/3/4/8/134861944/dosafuk.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/rs3_premier_club_2021trptw.pdfIn PDF document text
    • https://xizejaselaz.weebly.com/uploads/1/3/4/3/134357450/4336483f.pdfIn PDF document text
    • http://nakotigolajeg.scienceontheweb.net/chain_rule_problems_and_solutions.pdfIn PDF document text
    • https://dijizuwuke.weebly.com/uploads/1/3/3/9/133999270/xegevanifez-gusizipuror.pdfIn PDF document text
    • https://pemolopudamas.weebly.com/uploads/1/3/4/7/134753943/nipodalobimel_gopabi_muwoxirikatigu_bukuzifilam.pdfIn PDF document text
    • http://filuxunokenobud.mygamesonline.org/kilimakibawerujagixa.pdfIn PDF document text
    • http://electorat.org/cisco_glc-_sx-_mmd_datasheetu9pfj.pdfIn PDF document text
    • https://dukilukisa.weebly.com/uploads/1/3/1/0/131070258/tatinexoruv-kawajemipisi-dodufile-lawukireniwon.pdfIn PDF document text
    • http://redpandarecycling.com/cambridge_english_complete_pet_workbook_answersan4nl.pdfIn PDF document text
    • https://luxiwejewukon.weebly.com/uploads/1/3/0/7/130738755/mewopub_notibiz_kazepifowanake_fixitezujatoju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dotopaku.atwebpages.com/421669175.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_off0000e5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A7 5384 bytes
SHA-256: 94a0b3d0f454c2d51273b1a79ee3ed2020fa89a71f2dd17575b15ebcdf9f100e
font_01_sfnt_off0000f7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 10584 bytes
SHA-256: 410f013e08050191c5bc2ab505e798caba0556237e14b64e00d97b3bfb43b495