Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4ed1def56accdb…

MALICIOUS

PDF

70.1 KB Created: 2021-02-15 12:57:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 50885a8cc532a3e5548f3fcb389001ad SHA-1: dc16eae5120dfd9e08d8ace1b69a5046bb685b9e SHA-256: 4c4ed1def56accdbef9917eb77b5318b23ee4f394b582c7a86e4cfb6c34e37b7
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 dynamically generated or use link farms, indicating a phishing or SEO poisoning attempt. ClamAV detection and ML classification strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or malware delivery. No scripts were extracted, but the PDF structure itself is used to host numerous external URIs.

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://jottigo.ru/123?utm_term=irritrol+rd-600+manual+operation PDF link annotation
    • https://cdn.sqhk.co/zudilubal/hhialie/itunes_country_music_album_charts.pdfIn PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/9a4cd01bf14f11b.pdfIn PDF document text
    • https://cdn.sqhk.co/rolidofajug/OHticjd/geometry_jump_impossible_dash_game.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/icgches/laxuzugireribe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370286/normal_5fd33e5c38d51.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/qihhjgf/99230079565.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446784/normal_5fcacd0c4536d.pdfIn PDF document text
    • http://amsidisi.xyz/the_walking_dead_nowe_odcinki_201945ffn.pdfIn PDF document text
    • https://cdn.sqhk.co/rajunakeb/gchajht/tixadojomexota.pdfIn PDF document text
    • http://dimax-matrasy.ru/legosemisojupexkqojb.pdfIn PDF document text
    • https://cdn.sqhk.co/kisereta/5id9gcs/light_it_up_like_dynamite_song_samsung.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/gifjagg/rock_and_roll_racing_music_list.pdfIn PDF document text
    • https://cdn.sqhk.co/judixixelof/JijMigp/juvodilulula.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/rejiner/battleground_survival_offline_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/instagram_for_macbook_air.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/coplanar_waveguide_wavelength.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/38900868589.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_off0000d4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C3 5192 bytes
SHA-256: a45d393088138d078b7fbf04908ba8b4f979d641b9beb1208f88d0e25f2b5a9a
font_01_sfnt_off0000e64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64F 10376 bytes
SHA-256: 12de876b20ac185202f0d4102bc448abdfda190f514cee26964818cd07beaaf7

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