Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1950b9dda805e47…

MALICIOUS

PDF

77.3 KB Created: 2021-03-26 08:02:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44a3e0cf50d0b9b0cb7a8af03904bd56 SHA-1: 9e7df1ed49100a4127135f7da5d7e6df909f0fe4 SHA-256: f1950b9dda805e47eb0e396427629357e0a34a1abec9f820902068c299d80505
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external links, with a significant number pointing to potentially malicious domains, suggesting a link farm or distribution point for further malware. The document body, though heavily obfuscated, appears to be a lure related to search terms, aiming to trick users into clicking on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/award?keyword=bucharest+street+map+pdf
    • https://kumobavogi.weebly.com/uploads/1/3/2/3/132303339/kukasupenugavilowu.pdf
    • https://cdn.sqhk.co/dejijadu/DjegeN2/philip_kubicki_bass_for_sale.pdf
    • http://vuvopogawuxaxax.22web.org/latest_hd_movies_free_tamil.pdf
    • https://cdn.sqhk.co/nitunoda/ffqzgdr/best_horror_movies_on_netflix_hulu_amazon.pdf
    • https://cdn-cms.f-static.net/uploads/4501777/normal_5fd0c12849005.pdf
    • https://static.s123-cdn-static.com/uploads/4475375/normal_5fec8e308d454.pdf
    • https://cdn.sqhk.co/mekibekowufe/ajeZvif/fanatical_football_apk_uptodown.pdf
    • https://liguputuked.weebly.com/uploads/1/3/4/5/134501996/gulerijarowijabemof.pdf
    • https://xinelonaveguv.weebly.com/uploads/1/3/4/6/134606197/ec4a74e476.pdf
    • https://cdn-cms.f-static.net/uploads/4426954/normal_6038d2bbeee5a.pdf
    • https://tebadigizowi.weebly.com/uploads/1/3/4/1/134109241/1716896.pdf
    • https://cdn-cms.f-static.net/uploads/4385004/normal_602b3a54c59b3.pdf
    • https://cdn.sqhk.co/sirepajaku/jdgdBQP/88256389058.pdf
    • https://ruwufinojib.weebly.com/uploads/1/3/4/6/134643146/4830364.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ba8254cb-7e4a-43eb-b668-53ecaf2ec88e/words_to_describe_authors_writing_style.pdf
    • https://uploads.strikinglycdn.com/files/9e86b66a-51d7-488e-9daf-7ffadd55bc6e/cobra_detector_codes.pdf
    • http://xafotibelazes.rf.gd/729512149.pdf
    • https://uploads.strikinglycdn.com/files/9cf7e93c-22d6-4862-bba0-98f399645944/is_there_going_to_be_a_warrior_cats_movie_2020.pdf
    • https://uploads.strikinglycdn.com/files/e7659c8f-3900-4bb7-be16-6e564965796c/jetotozu.pdf
    • https://uploads.strikinglycdn.com/files/bc7aee24-3bf4-4f93-bd35-a91955bff540/32762496147.pdf
    • https://uploads.strikinglycdn.com/files/f8bbe035-1573-4ec0-b729-3beebd865567/best_way_to_learn_korean_for_free.pdf
    • https://uploads.strikinglycdn.com/files/61cbc817-e309-4e56-8db6-5a8718b5c0d3/mirezuroseb.pdf
    • https://uploads.strikinglycdn.com/files/7beb2890-9219-42b4-bd6e-ae023fa65955/simcity_4_free_download_softonic.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f19b.bin
c591438a739c8cbfa4a2d964ab34e6c19cf3b245e46f77aa9d7ea32231d34e74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 5412 bytes
font_01_sfnt_off000103dc.bin
1168ed33a1a0ff624a6e8d52cfa8bc9f71df226382d3786b9d68fdd201813d8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103DC 10636 bytes

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