Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab371870331b3e0…

MALICIOUS

PDF

92.7 KB Created: 2021-03-20 00:58:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b63e9e3c120ad20c874b56fbd40bc87 SHA-1: 20e34dc6f13c470efd2059d8ffefc6821efea800 SHA-256: 7ab371870331b3e09f752c1064481c9a5fc87eebc13510bb4bdea08e1823c6e8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to 'ponafet.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. Although no scripts were explicitly extracted, the PDF structure and extensive external links suggest it's designed to redirect users to malicious websites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/123?utm_term=animated+bear+pictures
    • https://cdn-cms.f-static.net/uploads/4420245/normal_602a293d1585d.pdf
    • https://cdn-cms.f-static.net/uploads/4380699/normal_5fdaca9f6b7b9.pdf
    • https://static.s123-cdn-static.com/uploads/4501486/normal_5fef59c53ee1b.pdf
    • https://nosilagime.weebly.com/uploads/1/3/4/6/134613039/katirudugajafuwuzo.pdf
    • https://cdn-cms.f-static.net/uploads/4493553/normal_603f757fbcb83.pdf
    • https://cdn-cms.f-static.net/uploads/4417656/normal_5fe796bd1d243.pdf
    • https://felinabaf.weebly.com/uploads/1/3/4/3/134380667/5533539.pdf
    • https://sodefabufu.weebly.com/uploads/1/3/4/4/134473286/xatibape-ruparogu.pdf
    • https://cdn-cms.f-static.net/uploads/4454977/normal_6039834977c0b.pdf
    • https://boxusuvibirux.weebly.com/uploads/1/3/5/3/135308560/tezifeguwodop-sexupolebolumo-topapekotutipam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/pipaneku/ms_sql_format_date_yyyymmdd.pdf
    • https://s3.amazonaws.com/pujirageg/55500031724.pdf
    • https://s3.amazonaws.com/perurulexi/what_is_the_best_free_daw_for_windows.pdf
    • https://s3.amazonaws.com/jenisozazewubo/casos_de_uso_ejemplos.pdf
    • https://s3.amazonaws.com/wurivuve/caedmons_hymn_old_english_version.pdf
    • https://s3.amazonaws.com/tinezedu/transcription_and_translation_practice_worksheet.pdf
    • https://s3.amazonaws.com/tuxenipup/types_of_animal_tissue_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/2319eeb5-a4d5-48dc-9dec-04dfcd8483fb/text_png_generator_online.pdf
    • https://uploads.strikinglycdn.com/files/33b19abd-e082-4ac8-8ef6-a7b3a629acd5/xevoze.pdf
    • https://s3.amazonaws.com/posufij/33231136800.pdf
    • https://s3.amazonaws.com/figidireki/berkshire_blanket_velvetloft_sheet_set.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fe2.bin
68b55efb5cfc73df1566e3368de686259920245aa32e19f985fd755a42efca8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE2 5088 bytes
font_01_sfnt_off000120f8.bin
7073015e0cfd7541a1ac499b9abcaf29402268ebb2f2eb5725605e752b2c3223		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120F8 3876 bytes
font_02_sfnt_off00012fdf.bin
24bc7cabeddcdd371404ddbd101c711cf3d8ef882f283ebc20e62af4e2c5accc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDF 11460 bytes
font_03_sfnt_off000156b9.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x156B9 4324 bytes

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