Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e695c856540824…

MALICIOUS

PDF

81.3 KB Created: 2021-04-06 10:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe5468cc260178fe6ddecc7714d104d5 SHA-1: 7898bad3b8d4706b8bf8a5f140793dcfe2b08edc SHA-256: a7e695c85654082446db8b82bbc93f75ca7d84b87bb2f9556bc84bee72908b56
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The document body, though heavily obfuscated, suggests a lure related to 'June 2018 geometry regents answers'. The presence of multiple external URIs and a high ML classifier score indicate a malicious intent, likely to direct users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/wix?keyword=june+2018+geometry+regents+answers+part+3
    • https://ropemobajakim.weebly.com/uploads/1/3/4/6/134694841/7e155c150792532.pdf
    • https://cdn.sqhk.co/zotofoza/hjajhig/90080104442.pdf
    • http://axacheat4.xyz/homelite_textron_chainsaw_manualh8uw9.pdf
    • http://sandiego-podcasts.com/51849092259b5kyx.pdf
    • http://okstore.info/borderlands_2_randomizer_modzb6ud.pdf
    • http://instapresent.site/the_caucasian_chalk_circle_full_playii3ty.pdf
    • https://cdn.sqhk.co/fopujetoros/bd8CVja/jebirezivana.pdf
    • https://cdn.sqhk.co/kunimanujage/hfbG0jh/74852982651.pdf
    • https://cdn.sqhk.co/rasepotobami/fibhaSK/dobuloroxebufulejew.pdf
    • https://cdn.sqhk.co/jupujezaxa/dwRjejc/tech_news_website_crossword_nyt.pdf
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/zifex_fimerelujeni_nudaxasakezini_dugokubebi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c3bb11cb-ba02-405d-8462-2b4421b436e1.filesusr.com/ugd/4c7814_fc532f9af9334bfca2e02eca6113eb5a.pdf?index=true
    • https://d0f5cf02-e55f-42e7-ba97-8a4d5a2b8368.filesusr.com/ugd/7f59a0_1908fe1d5e934127a915ca53b76b37ea.pdf?index=true
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_6d510e53cf4d4050ad918b0110c877d9.pdf?index=true
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_3b78c8eef3ec46b59b81da93ddb903cc.pdf?index=true
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_169df74924834d34aae2bf3ca0de5958.pdf?index=true
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_772a3408d509443d9fcd1d012027e46f.pdf?index=true
    • https://736f3f86-ac4a-4d06-be6b-3320275ea8ee.filesusr.com/ugd/cd27d0_ebd3d33564e74795ab5858cb0104395f.pdf?index=true
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_31d100aba02249ef864be58d7c161cc3.pdf?index=true
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_90d8bfd665134627a17afce261fa2136.pdf?index=true
    • https://351e5f87-f9e5-4015-92cd-d601692b9ec3.filesusr.com/ugd/a0d0d3_ae4dabe1083f42f99ea7997c86212953.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ef.bin
844d1d8e7e273dd7268f204bc531dc88a8c91a56feecd34b1ee016d84639aeea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EF 5972 bytes
font_01_sfnt_off0000fc50.bin
08a77e74ca2196bae9df5aac9b2e099ed7007c8331f92be4a8e9f66cf8307191		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC50 11152 bytes
font_02_sfnt_off00012298.bin
5ec08b49353f1a3b359f6d3a2da6678d255748991fc6cc591e176548fa886f35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12298 16068 bytes

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