Malicious PDF — malware analysis report

Static analysis result for SHA-256 d636992b389eb81d…

MALICIOUS

PDF

77.3 KB Created: 2021-05-18 08:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6b47aa1bd95b052a025b3538d124411a SHA-1: dd2e2450dc8d53e9e64423d57e914704023ba494 SHA-256: d636992b389eb81d60b55d01ec9faed9209bfa028d2785189e46a2035ee82402
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9956

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 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.
  • 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://golowaki.ru/strik?utm_term=divisiones+de+dos+cifras+para+quinto+grado PDF link annotation
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/wabel_serogusidutepi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488332/normal_5ff58a12e9ea2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392652/normal_605b5841e7276.pdfIn PDF document text
    • https://xaxozugine.weebly.com/uploads/1/3/2/3/132303195/9b28bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460450/normal_6062d2aec3229.pdfIn PDF document text
    • https://zivopelorikeder.weebly.com/uploads/1/3/4/6/134677217/fd9b01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476142/normal_5fdc609442309.pdfIn PDF document text
    • https://foguvebosep.weebly.com/uploads/1/3/5/3/135315209/1253770.pdfIn PDF document text
    • https://sifegofariwe.weebly.com/uploads/1/3/1/4/131437131/rikuwirijegeziv_mogawaxelaweneg_lajutum.pdfIn PDF document text
    • https://baziwiruxufuwav.weebly.com/uploads/1/3/1/4/131482892/malumazegubogudebibu.pdfIn PDF document text
    • https://bivejeweki.weebly.com/uploads/1/3/4/3/134322338/8489672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479441/normal_5fdc199c5d73d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_6064ba71d216e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456985/normal_5ffbdf2361189.pdfIn PDF document text
    • https://kafolegilu.weebly.com/uploads/1/3/2/3/132303068/2216307.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490371/normal_5ffe8492cbddc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470228/normal_5fcfaa9e58464.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/papotijukun.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/chemistry_question_paper_2019_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/50587592086.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/how_to_setup_airprint_on_brother_mfc-j4510dw.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/zifenoja.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/kifaberizusogiserul.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/21551860597.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/fadiguvi.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/burnham_gas_boiler_tech_support.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/kunabu.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_off0000ed07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 5476 bytes
SHA-256: e5f14ca5468b13069f1bb9e63ea0fe72ba21191e8a6b4a56bcea7bfab675c34b
font_01_sfnt_off0000ffc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC1 11640 bytes
SHA-256: 6009ad0be7a73c2b96561414ceea2cffe0641e7f46580d2ea4faacab02d24ec9

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