Malicious PDF — malware analysis report

Static analysis result for SHA-256 a686340a54b6328d…

MALICIOUS

PDF

86.1 KB Created: 2021-05-20 01:40:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72c9606fa37ecbd6e415115afdba9685 SHA-1: 3c9cdd77ab17dec4fde5aac7c0e711a349fa4043 SHA-256: a686340a54b6328de9b975278ae11789629354a9e2f8e6a1e2d8e4670395e8c8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://xezojetit.ru/strik?utm_term=fundamentals+of+management+robbins+8th+edition+pdf', is presented as a search result for a management textbook, suggesting a lure for phishing or malware. ClamAV detection and ML classification further support its malicious nature. No scripts were extracted, but the extensive use of external links points to a delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xezojetit.ru/strik?utm_term=fundamentals+of+management+robbins+8th+edition+pdf
    • https://cdn-cms.f-static.net/uploads/4413125/normal_605526f08eae2.pdf
    • https://fuwewarudizikip.weebly.com/uploads/1/3/4/6/134644733/7071135.pdf
    • https://tixilumudesowor.weebly.com/uploads/1/3/6/0/136095614/volav-fepudebad.pdf
    • https://cdn-cms.f-static.net/uploads/4460477/normal_6049591f2231c.pdf
    • https://kokezixunilo.weebly.com/uploads/1/3/4/0/134096179/3977295.pdf
    • https://cdn-cms.f-static.net/uploads/4487191/normal_6036b73aea179.pdf
    • https://sefewazugep.weebly.com/uploads/1/3/5/2/135293251/tedefigapuvi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://s3.amazonaws.com/mufukep/repogabutevamuwejeratate.pdf
    • https://uploads.strikinglycdn.com/files/1a79a309-be9a-455a-b4d8-260fdd121110/liwad.pdf
    • https://uploads.strikinglycdn.com/files/47d2b4d9-cafd-43d7-9192-ce6d0fa9183d/list_of_blood_test_do_during_pregnancy.pdf
    • https://s3.amazonaws.com/woxotopapozokev/wadobaxigapanomatubi.pdf
    • https://uploads.strikinglycdn.com/files/73fc93fe-535d-4342-8a88-c429020e4d3a/28850315476.pdf
    • https://s3.amazonaws.com/najubu/40368538725.pdf
    • https://uploads.strikinglycdn.com/files/53a4068a-78d7-4778-8a0b-0bb8cc2dc673/medezos.pdf
    • https://s3.amazonaws.com/navoburarovada/carvel_pistachio_ice_cream_ingredients.pdf
    • https://s3.amazonaws.com/fusidejebi/ketogene_dit_erlaubte_lebensmittel.pdf
    • https://uploads.strikinglycdn.com/files/0987c65d-e1b8-402b-94d4-af0e8d53b6c7/what_is_modern_world_mathematics.pdf
    • https://s3.amazonaws.com/tasufagijaremo/90377747282.pdf
    • https://uploads.strikinglycdn.com/files/b5cec90d-3777-4738-870d-80bd356b1502/gre_practice_test_sample_questions.pdf
    • https://uploads.strikinglycdn.com/files/4e2a5de9-5c26-4a9d-a232-0bc2a1d2cf88/lg_hbs_912_firmware.pdf
    • https://uploads.strikinglycdn.com/files/44fe9a9b-202c-43d0-b732-ab5928140018/brother_hl-5470dw_replace_toner_reset.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
    • http://www.gnu.org/licenses/gpl.html
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e51b.bin
e587d4bb45705e155ab8a36b2bdb8cc029d035853ad7bb143dd26940220c386d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE51B 5744 bytes
font_01_sfnt_off0000f869.bin
9277f3d163b260af5f7b4dd57d7e1fb7ca7e953d97a6b316b6ebf3002df3bdf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 7880 bytes
font_02_sfnt_off00010db0.bin
2afbc818a2641eb45d20ac72f31314d5c7ad89948ab805b9a30216ebd3d6579c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB0 11648 bytes
font_03_sfnt_off000134ee.bin
6a08870261e56bf8f867a6b578501c94364e04e003c0f1eec505a8367eb6e410		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134EE 16116 bytes

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