Malicious PDF — malware analysis report

Static analysis result for SHA-256 a056b7777a6ce840…

MALICIOUS

PDF

75.7 KB Created: 2021-03-31 10:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4b91e34e3710fbdcc5c926cce1755393 SHA-1: e0a6d17f0849b8379d4a7627afcc6f9d2fd95980 SHA-256: a056b7777a6ce840efda30995fc0dc5e9b9b304ed87d44994c3d27e2e9626d50
186 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 0.9997

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://crophysi.ru/award?keyword=nyc+sightseeing+map+pdf PDF link annotation
    • http://construt.site/how_to_record_sales_discount_in_myobxzodn.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/8Qiflhc/stickman_rope_hero_mod_apk_happymod.pdfIn PDF document text
    • http://jakor.pro/what_is_the_first_deadpool_comicci9sd.pdfIn PDF document text
    • https://jurujixomegisi.weebly.com/uploads/1/3/4/7/134745805/86d87361b35b77.pdfIn PDF document text
    • http://alisabor.design/25925353833zwof8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_605bfc9f6b80f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403118/normal_602b4ae131fc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456114/normal_605dcaea245d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495525/normal_6016ecde8ac19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481825/normal_605917564808a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393772/normal_600389ef45a7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457573/normal_602197d79328f.pdfIn PDF document text
    • https://cdn.sqhk.co/tidilotofuka/jazjiaF/tezigejawazexenodipinolok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_604d315b72fb0.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://kyukty68.xyz/98542062970d46t1.pdfIn PDF document text
    • https://vuzivofe.weebly.com/uploads/1/3/0/9/130969370/jeviwemobowid-sumukulek.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/fibesezati/xarawizorununegoketovex.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/wifi_password_dictionary_attack_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/l_agriculture_intensive.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_off0000ea1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1D 5512 bytes
SHA-256: cc49144f409a384903261be25f6bc8615f95397d064b5abb07fdb52f2162e97a
font_01_sfnt_off0000fccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCF 10776 bytes
SHA-256: 61ae559a3c5b7ac65fd536df8b3daac4b451ef0489abe934550d91d2aa3d8240

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