Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec6830750988757…

MALICIOUS

PDF

79.0 KB Created: 2021-01-19 01:40:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f6b192d010110fa9cd1ec4ccb87a29fd SHA-1: 9b4b3cf56a26f14a58048b6cd856c58b34c142d7 SHA-256: 2ec68307509887570211e2e2b31276252ed4080a5a398ffe0032df031795c555
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links pointing to various disposable domains and link farms, indicating a phishing or malware distribution attempt. The heuristic firings confirm it's a malicious redirector and link farm, and ClamAV detected it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to an 'introduction letter to parents from replacement teacher'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=introduction+letter+to+parents+from+replacement+teacher In PDF document text
    • https://lalidusuferub.weebly.com/uploads/1/3/4/4/134440540/tefavujavalimi.pdfIn PDF document text
    • https://revuzigo.weebly.com/uploads/1/3/4/3/134352577/a6b9fcaf8d.pdfIn PDF document text
    • https://site-1175252.mozfiles.com/files/1175252/moonpig_flower_discount.pdfIn PDF document text
    • https://site-1166671.mozfiles.com/files/1166671/best_period_tracker_app_2018.pdfIn PDF document text
    • https://site-1254436.mozfiles.com/files/1254436/7284612965.pdfIn PDF document text
    • https://pufoxedoj.weebly.com/uploads/1/3/4/4/134438994/04123.pdfIn PDF document text
    • https://kapebuzuzevasa.weebly.com/uploads/1/3/4/5/134587117/e49b58915.pdfIn PDF document text
    • https://cdn.sqhk.co/wetotuluxe/jbkEihI/nokulolumo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459326/normal_5fd155dc88a91.pdfIn PDF document text
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/xuwux-pazesefesababal-vuvudepimu-pivosefeburati.pdfIn PDF document text
    • https://bewepuxajijasi.weebly.com/uploads/1/3/4/3/134362307/nuxuvudumewozefi.pdfIn PDF document text
    • https://cdn.sqhk.co/sapidefapo/nmW3yji/download_game_real_drum_pro_apk.pdfIn PDF document text
    • https://vibebivenef.weebly.com/uploads/1/3/1/4/131412032/23dcc5ae3a6204.pdfIn PDF document text
    • https://pesajupamobe.weebly.com/uploads/1/3/1/6/131607203/vazodomaveju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 5332 bytes
SHA-256: 7cf7f2f0f18ab50285e45c973d0f1d7972b5794cb61f2ebd11e55fc21711d516
font_01_sfnt_off00010ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE5 10424 bytes
SHA-256: 81c949ffe77cc44a44745232d81c425497a96368f6a696d62a8f3588190d9415

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