Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f9df83271c1d32…

MALICIOUS

PDF

71.1 KB Created: 2021-01-19 08:12:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5561cf8a3179b745bd5f69d98f237f2e SHA-1: be38e4a2ea7fb768a5e07f0d0d355fc413f17ddb SHA-256: 44f9df83271c1d32212236d37d3442703013473caaf8bc65378db1b54889f3cc
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 obfuscated or lead to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The document body, though heavily corrupted, contains text related to 'Althoff catholic high school employment', suggesting a lure for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and link to external content.

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
  • 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://jacksth.ru/123?utm_term=althoff+catholic+high+school+employment PDF link annotation
    • https://cdn.sqhk.co/sirejeforox/DpQwbha/33849085168.pdfIn PDF document text
    • https://site-1177817.mozfiles.com/files/1177817/ramuxosamu.pdfIn PDF document text
    • https://site-1084368.mozfiles.com/files/1084368/35123643373.pdfIn PDF document text
    • https://kavekoda.weebly.com/uploads/1/3/5/3/135326791/nanifojed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371261/normal_5fa641386ffaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393349/normal_5f9a6f3d663b5.pdfIn PDF document text
    • https://bugitepekasi.weebly.com/uploads/1/3/4/6/134669175/papat-nabazu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391620/normal_6005769c6f091.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378164/normal_5fda02475b20a.pdfIn PDF document text
    • https://site-1173140.mozfiles.com/files/1173140/vogamidamamotufepob.pdfIn PDF document text
    • https://lavivatum.weebly.com/uploads/1/3/1/4/131437335/ribolu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nedajazamofo.epizy.com/aqualung_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/aerodrome_design_manual_9157_part_4.pdfIn PDF document text
    • http://topadut.epizy.com/jogabivuzite.pdfIn PDF document text
    • https://s3.amazonaws.com/kizuporowefib/5.2_puzzle_time_answer_key_geometry_what_did_the_grouchy_baker_make.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/marvel_civil_war_comics_1-_7.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/7715395434.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_off0000d966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD966 5424 bytes
SHA-256: dbb30a9bf7be318a9306e0a6a2a13f28a6a3143c6cf039d31d37faf894043232
font_01_sfnt_off0000ebca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 10288 bytes
SHA-256: e2e799fe98177824e56b70354bcf6621d841db8f4981331ac130f735f82441d6

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