Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dcd8fb4df48c0c6…

MALICIOUS

PDF

90.6 KB Created: 2021-03-09 13:23:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 27a5462323580f2890c3880e68ab1558 SHA-1: 3a2c77a019c24446e9a8c01abcdf7598c786a91e SHA-256: 6dcd8fb4df48c0c64f0c29f0fb5a76f7b5b7925adc51096668df4cec28aabed1
156 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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://fokemale.ru/strik?utm_term=how+to+start+muscle+memory+for+beginners PDF link annotation
    • http://testersairf.xyz/f5ndb.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/whirlpool_duet_sport_ht_capacity.pdfIn PDF document text
    • http://huseyincanx.com/street_of_rage_4_characters_unlock45dp9.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/sibomoludogus3sv55.pdfIn PDF document text
    • http://mesanezedid.mypressonline.com/39455397888.pdfIn PDF document text
    • https://rapovadok.weebly.com/uploads/1/3/4/7/134705404/5405148.pdfIn PDF document text
    • http://jonebukusopovet.mygamesonline.org/23712245112.pdfIn PDF document text
    • https://rabusefikitane.weebly.com/uploads/1/3/5/3/135314736/4912384.pdfIn PDF document text
    • http://vawurabel.mygamesonline.org/habitos_alimentarios_en_estudiantes_universitarios.pdfIn PDF document text
    • http://velesvoyage.ru/28441157274s85g1.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/23369900334v8zf5.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/wuwewomijufixabitam.pdfIn PDF document text
    • http://nekretnine.site/sample_maternity_leave_letter5unct.pdfIn PDF document text
    • https://mexepuxirubu.weebly.com/uploads/1/3/4/6/134663189/7be82.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/falufusu/pdf_to_word_free_android.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/unlock_bootloader_sony_xperia_x_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/checksum_transformation_in_ssis_2012.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/bink2w64._dll_for_far_cry_4.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/ff14_bardam_s_mettle_guide.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_off00011538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11538 5496 bytes
SHA-256: d97dd95cafbdb67b023673029adbe3fe96636c3001976ab9d9dd830e156c096e
font_01_sfnt_off000127e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E8 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00013076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13076 13492 bytes
SHA-256: e43a1d8f331f6c996a593c7f09b608a62e4e40d8c45a9c1cc129d0e9f175308e

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