Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e13bfc9a6f83837…

MALICIOUS

PDF

81.4 KB Created: 2021-05-04 04:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ff90095bd2ea019f6ed68d33c1b4e698 SHA-1: 5a0cc146b39183f6bd020aab4d87f4ddd7aa28d4 SHA-256: 8e13bfc9a6f83837efc97e058bf2b1d29d09815314f1aa29dc45a1b56aef794e
186 Risk Score

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 0.9996

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://lozipotod.ru/strik?utm_term=hp+photosmart+7520+ink+cartridges+amazon PDF link annotation
    • https://tegidaweriwasul.weebly.com/uploads/1/3/1/4/131483440/vaxemosixoxogomutis.pdfIn PDF document text
    • https://tupenozisi.weebly.com/uploads/1/3/4/0/134012303/popir-nipebojex-saxalubituwolex.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CFgdiND/wobokosomapodotiw.pdfIn PDF document text
    • http://catsism.com/kuzujivofuzubulavuasljv.pdfIn PDF document text
    • https://dugigoje.weebly.com/uploads/1/3/4/7/134754128/4694157.pdfIn PDF document text
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/a1a9e500.pdfIn PDF document text
    • https://xidevakunowun.weebly.com/uploads/1/3/4/0/134017194/gokaf-kefipagisax-putuzusolexid-mumuwu.pdfIn PDF document text
    • http://smotrikino.fun/77273152000qv8nk.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/Cqhi0W0/71274357497.pdfIn PDF document text
    • https://cdn.sqhk.co/xejoxoka/jgHKiaM/average_premium_under_obamacare.pdfIn PDF document text
    • https://cdn.sqhk.co/bexuxoxabim/iigdYjf/31839567221.pdfIn PDF document text
    • http://organicsss.space/222544201277gn0t.pdfIn PDF document text
    • http://shopwithsale.website/31253578820mvruy.pdfIn PDF document text
    • https://zimosamizafokox.weebly.com/uploads/1/3/6/0/136091721/9b4e9f43d.pdfIn PDF document text
    • https://xomupufemi.weebly.com/uploads/1/3/4/3/134322732/9689815.pdfIn PDF document text
    • https://cdn.sqhk.co/bemaxopig/eyhjidu/stuntman_ignition_ps3_amazon.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.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/dopugaxelelema/play_store_app_apk_er.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/3813260939.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/metformin_850_mg_for_weight_loss.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/numerical_aptitude_test_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/asp.net_core_3.0_mvc_tutorial.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_off0000fe79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE79 6008 bytes
SHA-256: 7d5ed9d60666a6bc4f4cb6ec518c8f486e2d85638e96b25c16731ed1162eb285
font_01_sfnt_off000112d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D5 10964 bytes
SHA-256: 0d12f3966e098aac8be1b5cdb8480b0f40d13b29839d52062f2df95d317a16cf

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