Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2a7714f3e46bba…

MALICIOUS

PDF

74.4 KB Created: 2021-02-08 03:54:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3c7372c253fe322d2ab88657bb570b77 SHA-1: 72565e563627c50d19e58f0cbb82993ff3ff543b SHA-256: db2a7714f3e46bba6c1091c804f9143425f96aabdce5e926bd7d920195fa5934
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL specifically mentioning 'market helper apk xda', suggesting a lure for users seeking Android applications. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure itself is designed to redirect users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=market+helper+apk+xda PDF link annotation
    • https://cdn.sqhk.co/pixazizaze/ymjbXjb/tuxuwibaradekepobatajitiw.pdfIn PDF document text
    • http://fit-italy.space/model_cerere_demisie2c1ac.pdfIn PDF document text
    • https://cdn.sqhk.co/jisujesox/9nB1hh7/the_bowl_naples_menu.pdfIn PDF document text
    • https://befewegumezozem.weebly.com/uploads/1/3/1/4/131453636/fopatusivifera_konagan_porikezagu_kiweleze.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/jfFjgnx/piano_tiles_4_magic_tiles_go_2020_descargar.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/xukanomarexumu/fuxifumikuzarasosuseze.pdfIn PDF document text
    • http://tesunujazo.epizy.com/green_color_wallpaper.pdfIn PDF document text
    • http://gokamevagared.epizy.com/gezeborilisonekifewa.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/geladeira_brastemp_frost_free_clean_zyrium_manual.pdfIn PDF document text
    • http://poresiz.epizy.com/vimeo_video_player_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/grade_1_science_worksheets_plants.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/love_yourself_answer_e_version_songs.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_off0000e8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DF 5008 bytes
SHA-256: e5b94373643a0aac96ff4a2f177a64bfe0e16fc2bdb08dc4ff3ea4bf0bafce5f
font_01_sfnt_off0000f9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EC 10352 bytes
SHA-256: 3351be591ff45272cfdde9400354c6fd26f52c0e9c3344419b1b4b55e18150f9

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