Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8e46aa0bc0ec63…

MALICIOUS

PDF

84.8 KB Created: 2021-05-19 13:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 170f43eccec7511b8c570065f076c5f4 SHA-1: 22d346a336216f394f6b84692868d112749190a6 SHA-256: 4d8e46aa0bc0ec634ac6fbd28fba36a767f36c2b9f539ca0f1e9d7e0a09622c7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one prominent URL pointing to a suspicious domain associated with 'bigo live hack mod apk 2020'. This suggests a phishing or malware distribution attempt disguised as an SEO link farm. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://xezojetit.ru/strik?utm_term=bigo+live+hack+mod+apk+2020
    • https://static.s123-cdn-static.com/uploads/4415300/normal_5feb21d7e5b1b.pdf
    • https://cdn-cms.f-static.net/uploads/4414358/normal_602b61b191899.pdf
    • https://dinowupeguf.weebly.com/uploads/1/3/1/3/131379410/siradus.pdf
    • https://tunuwadubozowe.weebly.com/uploads/1/3/4/3/134363043/boxore_nejizizuz_mobozipok.pdf
    • https://cdn-cms.f-static.net/uploads/4406771/normal_606b7a4e40bca.pdf
    • https://static.s123-cdn-static.com/uploads/4369518/normal_5ff5af7bd1684.pdf
    • https://cdn-cms.f-static.net/uploads/4476272/normal_5fd175c215fff.pdf
    • https://cdn-cms.f-static.net/uploads/4462681/normal_606123f400568.pdf
    • https://cdn-cms.f-static.net/uploads/4427268/normal_603e87c46186c.pdf
    • https://cdn-cms.f-static.net/uploads/4476941/normal_606023a3f3882.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0ec58ff2-4a90-4609-b80b-003041c8e50d/herman_miller_aeron_for_sale_near_me.pdf
    • https://s3.amazonaws.com/xukonakefules/september_2016_calendar_template_word.pdf
    • https://uploads.strikinglycdn.com/files/6a46812c-5dab-4859-a813-10fd1edd7734/what_is_the_meaning_of_pogrom.pdf
    • https://uploads.strikinglycdn.com/files/f0602c0a-0764-417c-aeec-50c6b5fc31af/why_are_my_jlab_earbuds_not_charging.pdf
    • https://uploads.strikinglycdn.com/files/4d75b581-812d-41e5-863b-c2684cf953f7/sujuw.pdf
    • https://uploads.strikinglycdn.com/files/b514bf99-9902-4d22-adff-de5dd511657e/b_blood_type_diet_recipes.pdf
    • https://uploads.strikinglycdn.com/files/58b2839e-4669-4697-aa6a-0ce68012384a/what_is_gift_of_discernment.pdf
    • https://uploads.strikinglycdn.com/files/3664629d-71f2-4801-83fc-482d78dc4571/41954961475.pdf
    • https://s3.amazonaws.com/dobikasukavu/ti-84_plus_silver_edition_blue.pdf
    • https://uploads.strikinglycdn.com/files/f9cbf2ff-d91b-401b-8807-89605def9dfc/black_ice_frostbear_fnaf_ar.pdf
    • https://uploads.strikinglycdn.com/files/85a303e2-02e9-4dae-9702-d510446fa922/87842310230.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://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_off0000e7a0.bin
33ef2328b753a4254b2230724100f29f3a5f18d949707e8b9c8ecc9c94362a39
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A0 5660 bytes
font_01_sfnt_off0000fac3.bin
f8e8b41fbf5b9c50557d481abc62e741a32f2437b9174f3b3801b448c6dc1368
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC3 3160 bytes
font_02_sfnt_off000107ce.bin
70716b9713fe9c074fa8cfe867518ce8a105ee0b7bc13338e33e89d2f8424e08
pdf-font-stream PDF embedded font (sfnt) at offset 0x107CE 12184 bytes
font_03_sfnt_off00012fb3.bin
4b52fd5da643d9c08cc0a86f773b2f024e3274f3f861dfcac100db1ef433cf06
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB3 16164 bytes