Malicious PDF — malware analysis report

Static analysis result for SHA-256 db633878cdd752c7…

MALICIOUS

PDF

78.3 KB Created: 2021-03-05 08:05:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f55c3b4ef908493495db586d117e7cc0 SHA-1: 8208f68a3f9bcb548f8438b29e565115ba55c54e SHA-256: db633878cdd752c7125ebf1db05b1474099d63941084b341b6c62c3abb1b2b1a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://nipisod.ru/award?keyword=make+instant+money+online+absolutely+free+paypal PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4494875/normal_5fe03058b54fe.pdfIn PDF document text
    • https://cdn.sqhk.co/lamajemomu/gcihqjf/voworujupozokuzuse.pdfIn PDF document text
    • https://gekiwudev.weebly.com/uploads/1/3/4/7/134769606/564aa0e6a9b8f0d.pdfIn PDF document text
    • https://jotonude.weebly.com/uploads/1/3/1/3/131398177/zuwozu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462727/normal_5fcb657eb5778.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/ribidoguxupaluzubode.pdfIn PDF document text
    • http://jamotovoxut.mywebcommunity.org/aa_back_to_basics_book_free_download.pdfIn PDF document text
    • http://subuxiwubemew.getenjoyment.net/how_to_crochet_a_blanket_border.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365620/normal_5ffebfc4d1bad.pdfIn PDF document text
    • https://cdn.sqhk.co/medukukekuke/gMIhiig/37313586773.pdfIn PDF document text
    • http://japancar-sib.ru/kujejuruniwesenibamaresozlkm6.pdfIn PDF document text
    • https://cdn.sqhk.co/dovinokobez/fidegj2/stickman_legends_shadow_apk.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/rinnai_infinity_24_installation_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/iVC3ijc/f1_mobile_racing_mod_apk_1._9._20.pdfIn PDF document text
    • https://xovosoze.weebly.com/uploads/1/3/4/3/134370725/wuxoti-pifaralexerus-kibemejikegis.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/97390694909.pdfIn PDF document text
    • http://uabiomanix.xyz/cardinal_and_ordinal_numbers_english_worksheetbethc.pdfIn PDF document text
    • https://cdn.sqhk.co/laxefotogulo/ibpihji/castle_crashers_ps4_trophies_not_saving.pdfIn PDF document text
    • http://bawazofo.getenjoyment.net/429375793.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/fogodununejiwakexovox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D3 5240 bytes
SHA-256: a3c61433921d6fc4d2a41e336c7af305a73459381f6678251a0138e87e87fed8
font_01_sfnt_off0000f995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF995 10428 bytes
SHA-256: 2c120769679f5d034dd3178b0dee75fe7d523d99c3ce87589b963bea280b791c
font_02_sfnt_off00011d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D40 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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