Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c8e0b0afd09ca7…

MALICIOUS

PDF

73.8 KB Created: 2021-03-21 02:42:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f3dc4d43de20ccf9ee3287b0e05a3146 SHA-1: 5ca259c3fedaf313c94576186e39ce5d3d5c0ef3 SHA-256: b1c8e0b0afd09ca7fde6a68fa7e9f54ffa25c8d97dfe8f5f6b271e9a8570096b
146 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. It uses a QR-code lure. 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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://maypoin.ru/wix?keyword=csi+florence+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/lexijunibul/WgdieTT/hangout_with_yoo_instagram.pdfIn PDF document text
    • https://bazafegaxu.weebly.com/uploads/1/3/1/3/131383427/fepajumasana-valenominavana-renanetil-zupemiburesaxop.pdfIn PDF document text
    • https://wajegeteb.weebly.com/uploads/1/3/4/8/134896445/228043205b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419424/normal_6046e363daec6.pdfIn PDF document text
    • https://cdn.sqhk.co/sowojusawepu/baujjjf/21240232008.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/fhcghOJ/43634838916.pdfIn PDF document text
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/dawigala.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378845/normal_5fcc1a2378ff8.pdfIn PDF document text
    • https://xejinifinedi.weebly.com/uploads/1/3/5/3/135305438/tegelug_finokiwagexiki_lodudifezamosub.pdfIn PDF document text
    • https://faloxumotib.weebly.com/uploads/1/3/4/6/134646793/gotusokusotadi-daduxi.pdfIn PDF document text
    • https://laxepesijuniz.weebly.com/uploads/1/3/1/3/131383562/7574684.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424696/normal_6007c2e4f09d6.pdfIn PDF document text
    • https://cdn.sqhk.co/linewebozid/iejcgeO/42870509548.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vifasuwa.epizy.com/bsp_thread_sizes.pdfIn PDF document text
    • http://luwawabegopit.rf.gd/downy_lavender_vanilla_dryer_sheets.pdfIn PDF document text
    • http://sovizurimi.rf.gd/android_tablet_reviews_budget.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/83928783717.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/catchers_mod_apk_rexdl.pdfIn PDF document text
    • http://pafapijeneradab.rf.gd/cpm_algebra_2_connections_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/runescape_priest_in_peril_quest_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/how_long_can_a_live_christmas_tree_last_indoors.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_off0000e36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36A 5032 bytes
SHA-256: 682c2ddc82756ebb379f6c59261b04ca9bfcf2d18d325820ad1832d34de3d633
font_01_sfnt_off0000f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 10860 bytes
SHA-256: 77c7f223e3a7fddd413504f31fbaaf8da1f2dd2bab0691f55c906db0eeecbbc8

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