Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d818357d8fc6089…

MALICIOUS

PDF

83.7 KB Created: 2021-02-14 01:19:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: b14896785f17e65d194d0321e994982f SHA-1: 14ca36fffca8be0f79146e72c633d6071046bf94 SHA-256: 8d818357d8fc6089cb069083a2d42fa01626969fd204080a80c22688326c0ecc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The primary URL, 'https://druttle.ru/wix?keyword=chapter+2+atoms+molecules+and+ions+answers+to+exercises', suggests a lure to trick users into visiting a site that likely hosts malware or phishing content. The ClamAV detection and ML classifier further support its malicious nature.

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://druttle.ru/wix?keyword=chapter+2+atoms+molecules+and+ions+answers+to+exercises PDF link annotation
    • https://mepokebifonamos.weebly.com/uploads/1/3/4/0/134096039/totiwela.pdfIn PDF document text
    • https://lixazasowab.weebly.com/uploads/1/3/4/5/134588429/d995d0f48ecf.pdfIn PDF document text
    • https://pidujalibogi.weebly.com/uploads/1/3/1/3/131380128/a65b0d1f04e8354.pdfIn PDF document text
    • https://talogaxuzule.weebly.com/uploads/1/3/4/5/134596774/repob.pdfIn PDF document text
    • http://dapodulasopo.iblogger.org/senior_business_analyst_job_description.pdfIn PDF document text
    • https://cdn.sqhk.co/jerizukop/OXNgedi/12419986153.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
    • http://mezezix.rf.gd/hobo_with_a_shotgun_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/97192049104.pdfIn PDF document text
    • http://xojasupolovoga.rf.gd/twikle_twinkle_little_star_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/beautiful_child_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/83507270249.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/bully_size_200.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/kindle_to_epub_converter_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/identifying_proper_and_improper_fractions_worksheets.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_off0000f383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF383 5508 bytes
SHA-256: 84de8dfa00edc80125cf6309dd638b157d3d091b02a0b4256ee901b576df6b42
font_01_sfnt_off0001062f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062F 14244 bytes
SHA-256: dd92b1572734a1bd2e55f59d212086548ad0da79a9b79786409bccdbc5226109
font_02_sfnt_off0001334e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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