Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e68993627c5f37…

MALICIOUS

PDF

68.4 KB Created: 2021-03-22 15:40:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1ef741191c307da34e45feb8b5d7bbc8 SHA-1: 8266bf0643488520e5eb87d37534fe9d657dbbed SHA-256: 25e68993627c5f3733a0c851dcc34411fefd2658cc38b2cc7737ac46e292d7f2
186 Risk Score

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. 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-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.
  • 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://midufefew.ru/123?utm_term=pubg+awm+suppressed+ringtone PDF link annotation
    • https://volifutizur.weebly.com/uploads/1/3/4/6/134602954/40872ca3729140.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/jungle_adventures_3ldt6j.pdfIn PDF document text
    • https://mafaredoli.weebly.com/uploads/1/3/2/6/132695491/jakomowagojilav.pdfIn PDF document text
    • https://foguvebosep.weebly.com/uploads/1/3/5/3/135315209/9991231.pdfIn PDF document text
    • https://romenazojojeles.weebly.com/uploads/1/3/0/7/130775884/vanokemiserijo.pdfIn PDF document text
    • https://senekuzoje.weebly.com/uploads/1/3/5/9/135978249/xefowosolakima.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/kelarunem_xebotozetadig_fepevopile.pdfIn PDF document text
    • http://umkatrade.ru/quran_pak_with_urdu_translation_audio_free_downloadqlfc9.pdfIn PDF document text
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/janapaledi_wotunofapagaji_denuwejizepiw.pdfIn PDF document text
    • http://zasoremejoka.iblogger.org/21011988785.pdfIn PDF document text
    • https://jedexapotup.weebly.com/uploads/1/3/4/4/134472831/kemed-saxavo-kupimekuvusagun.pdfIn PDF document text
    • http://boevoenlp.com/mokeropg4nfm.pdfIn PDF document text
    • https://kuvixajixi.weebly.com/uploads/1/3/1/6/131637850/likanidoji.pdfIn PDF document text
    • https://xidifapub.weebly.com/uploads/1/3/0/8/130873728/416ee6.pdfIn PDF document text
    • https://rawekawus.weebly.com/uploads/1/3/4/4/134467784/mevivufob_lisivasaxus_debutuzexe.pdfIn PDF document text
    • https://kasewipiliri.weebly.com/uploads/1/3/4/9/134901701/719405.pdfIn PDF document text
    • https://kowuzuworos.weebly.com/uploads/1/3/2/6/132682574/wovazomebi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuxanewelupeluv.epizy.com/can_adobe_acrobat_reader_convert_to_word.pdfIn PDF document text
    • http://xezeruv.epizy.com/90382220778.pdfIn PDF document text
    • http://votofeki.epizy.com/77605878108.pdfIn PDF document text
    • https://854c9a35-5343-4b72-ba37-357c0fe39ab3.filesusr.com/ugd/e2f197_4aa28c4f3dcb478c8bdc44459f31ed9b.pdf?index=trueIn PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_3ce5729f30bc4b76838d3dd79a13547b.pdf?index=trueIn 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_off0000ce1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1D 5480 bytes
SHA-256: f2c46dd2564ca4e7e8f6caaf4eba5d2111c8f500a75c1da4dfccc443da167ce1
font_01_sfnt_off0000e0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B6 10488 bytes
SHA-256: be60b65fa2d63812f0bf79b1f8b67e6e56a104d61e9e0b8b5af643052d5ad1c4

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