Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3fff195cafae71…

MALICIOUS

PDF

77.2 KB Created: 2021-03-23 10:58:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a099239fe84c5459bf31a957db0745d7 SHA-1: d3ab7910ce8b07d981d533ecb580969dfdcb2625 SHA-256: ba3fff195cafae711e15769b7338a78fdc94928517300d49d926dbea041a2620
206 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the malformed stream length heuristic further support the conclusion that this PDF is designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://xezojetit.ru/strik?utm_term=how+to+test+an+american+hunter+deer+feeder PDF link annotation
    • http://fullpisetc.ru/fanepuxorowebamiberekudeedzxo.pdfIn PDF document text
    • https://cdn.sqhk.co/sazipuvaxiv/ggi0ggv/wizz_air_stock_london.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/jiNAheK/rosugarekubidulem.pdfIn PDF document text
    • http://hurleyshamburgers.com/at_t_digital_life_technical_supportervw9.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/1JUu3nA/tmnt_rooftop_run_apk_free.pdfIn PDF document text
    • https://cdn.sqhk.co/fepogosu/jiIgeha/xbox_series_s_restock_times.pdfIn PDF document text
    • https://cdn.sqhk.co/nivodoruw/3JicMjg/off_road_travel_4x4_hill_climb_mod_apk.pdfIn PDF document text
    • http://choosenews.space/gafupiregopewomixinisugod3zcsd.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/eM6gdhj/tadudodafazita.pdfIn PDF document text
    • https://cdn.sqhk.co/bujavenizake/geAc2ji/kugilamakofujetijeduvetin.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/mhjhcyw/99482182448.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
    • https://s3.amazonaws.com/godewumazek/biology_textbook_class_10.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/badshahi_angti_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d15cb20c-f538-4af8-8567-e7735062c241/power_book_ii_ghost_episode_7_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42a88365-7621-4f6d-88ad-d8027a442ea8/vamuzumek.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/zagekabotufexirifimaxil.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/jiwanekerugupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5770519-8181-42b9-93ed-f3ee48b52a9d/8342759438.pdfIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_c4fc9662b9174fdda9c5d39e1092d71f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/62022769249.pdfIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_e60ef653f9e348abbed019cab2fe215a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbf9b9d1-3263-4212-b6d7-31e6d098f6d8/bifigubisidametavav.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F5 5164 bytes
SHA-256: 4a4e53f2319fa066c6820c31ff845927e784fc809f0e8c9381d3ebef0915059c
font_01_sfnt_off0000f45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45F 10608 bytes
SHA-256: 12987f8984b22b2180235a3d6d4579e5b8e060328a99e50d4f5e3ce52cb93b43
font_02_sfnt_off000118b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B4 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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