Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9980a0f8287187f…

MALICIOUS

PDF

80.7 KB Created: 2021-04-01 02:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd32d01363d893a2c803b9765dc27988 SHA-1: a34a0f6e3e1323fb7e3dae7af4ec8fbcec00ecd0 SHA-256: c9980a0f8287187fd4a141f526d31030b59d0ee32d2106e820e4dc7097baac03
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, many of which point to suspicious domains and appear to be part of an SEO link farm designed to attract traffic. While no scripts were directly extracted, the PDF structure and the presence of numerous external URIs suggest it's intended to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/aws?utm_term=la+la+land+ukulele+chords+demi+lovato
    • http://custits.space/verb_to_be_present_past_and_future_exercisesqbha7.pdf
    • http://doucheapp.xyz/soar_se_caen_los_dientes_de_abajokmj49.pdf
    • http://supernefritroller.xyz/4019397825312c30.pdf
    • http://raicen.com/lofiluxunuxabevexidtcry.pdf
    • http://centerverifybadge.com/washington_post_subscription_deals_amazon_primetb6bq.pdf
    • http://raisinsapp.pro/pemiwusijariree7nos.pdf
    • http://dusefoxabukaza.22web.org/perfect_ellen_hopkins.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bojafazes/18878769694.pdf
    • https://uploads.strikinglycdn.com/files/7ee5a1f2-865a-422f-8823-d337a59b8211/98648412054.pdf
    • https://uploads.strikinglycdn.com/files/3f3614e5-7316-440a-b76d-d81f12c6380a/sujetorifetanidim.pdf
    • https://uploads.strikinglycdn.com/files/2630ee90-930a-444c-8e75-03d2beb6b078/whats_the_best_psi_for_a_pressure_washer.pdf
    • https://s3.amazonaws.com/kevava/jingle_bells_saxophone_sheet_music.pdf
    • http://maboduxivugiv.rf.gd/cartoon_photo_app_apk.pdf
    • https://uploads.strikinglycdn.com/files/d98e5882-3bc3-4b3d-9b15-a8b8c219057c/98186947822.pdf
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_42a1d94fa86b406ba6235e689ff17457.pdf?index=true
    • http://farilofisimoru.rf.gd/kijegeg.pdf
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_1d68cdc2d0684f56b9177ca17579e7ff.pdf?index=true
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_0b6510e32c6546eb9d1303c4e4a01ffb.pdf?index=true
    • https://s3.amazonaws.com/xisakazelelinim/19951801377.pdf
    • https://uploads.strikinglycdn.com/files/0a99c551-93cd-40c4-a26f-87ff8a11f87e/dell_optiplex_7010_driver_cab_windows_7_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff9.bin
6ee9c4ac67323b7b7dca2e087b47217e1449ce4aa3430739d71685c905411f91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF9 5124 bytes
font_01_sfnt_off00010138.bin
57c472a91f455218499ba8edc0411b49390e91ca478276eb1a9ba7bce5796510		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 11204 bytes
font_02_sfnt_off00012755.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12755 4324 bytes

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