Malicious PDF — malware analysis report

Static analysis result for SHA-256 f349687db90660f0…

MALICIOUS

PDF

99.7 KB Created: 2021-02-25 11:05:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: becd17a68f745c8e780f8dfda0f83d69 SHA-1: 74462bb83bce651eb0d6fd38a3517f86a70c0e7f SHA-256: f349687db90660f09d2327c2562e7ef7af271d10ce92160c4df4afa97abb5363
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'crophysi.ru'. This URL is likely used to lure victims into a phishing scheme, as suggested by the URL's keyword parameter. The ML classifier also strongly indicated maliciousness, and ClamAV detected it as a phishing trojan. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://crophysi.ru/award?keyword=qual+o+melhor+fone+de+ouvido+bluetooth+jbl In PDF document text
    • https://cdn.sqhk.co/mibajufaneja/W7aTLJ0/best_80s_music_playlist_youtube.pdfIn PDF document text
    • http://tugofexofuwaza.22web.org/11_22_63_trailer_deutsch.pdfIn PDF document text
    • https://cdn.sqhk.co/dusaradezat/ge0hiij/88025777143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469103/normal_5fd0acbc64a71.pdfIn PDF document text
    • http://kopavavabigi.66ghz.com/20911680846.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483365/normal_5ff781fa38d23.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/misepukapoxuz.pdfIn PDF document text
    • http://nosaxumuv.iblogger.org/roller_bearing_design.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_602b64a7d40c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380076/normal_60070cfa96d37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390324/normal_5fdba07c13f42.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/Zf3AgdD/lawit.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/legesiliv/banarasi_silk_sarees_information.pdfIn PDF document text
    • http://tafiwepamubov.atwebpages.com/what_is_an_example_of_a_bilateral_contract.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/moultrie_mcg-13034_manual.pdfIn PDF document text
    • http://beruwawi.rf.gd/allen_carrs_easyway_to_stop_smoking.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/jio_tv_apps_free_for_pc.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/seven_years_old_song_mp3.pdfIn PDF document text
    • http://mujigivufutufu.rf.gd/casio_watch_module_no_2747_manual.pdfIn PDF document text
    • http://xorosobodudirug.rf.gd/python_list_sort_lambda_multiple_keys.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_off000146aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146AA 5308 bytes
SHA-256: 2373e724734126724d34509d33844ce5448633f4431cfb6d674ad42b79095192
font_01_sfnt_off00015896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15896 12840 bytes
SHA-256: 1b64a2507059ae8497304944b33b52b6cdd1f5cc0519afb2574e45103821a3f5

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