Malicious PDF — malware analysis report

Static analysis result for SHA-256 48d5f8629205b73f…

MALICIOUS

PDF

78.4 KB Created: 2021-03-16 03:39:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 207b8d5056421de47073ea6db3be95a6 SHA-1: 2cfe9f7ae4b13a1899b35048ed7b20827ab2ca96 SHA-256: 48d5f8629205b73f81acf2098f83201e8e47c69917fde6c0073dc71f7fd313e8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to SEO-related content, suggesting a link farm or phishing lure. Heuristics indicate a high likelihood of malicious intent, with ClamAV specifically identifying it as a phishing trojan. The embedded URLs are the primary indicators of malicious activity, likely leading to further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/award?keyword=meaning+of+business+letter+pdf
    • http://nitafibejuze.mygamesonline.org/describing_people_s_personalities_exercises.pdf
    • https://xegunato.weebly.com/uploads/1/3/4/3/134315925/f3e0459de3ff.pdf
    • https://static.s123-cdn-static.com/uploads/4414680/normal_5feb8ce832031.pdf
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/7227446.pdf
    • https://cdn-cms.f-static.net/uploads/4368984/normal_5fd388226d353.pdf
    • https://static.s123-cdn-static.com/uploads/4385620/normal_5fed34f093202.pdf
    • https://molavose.weebly.com/uploads/1/3/5/3/135350427/c216478e2.pdf
    • https://cdn-cms.f-static.net/uploads/4444657/normal_5fd1764b77285.pdf
    • https://wobikuneli.weebly.com/uploads/1/3/2/7/132741052/6692491.pdf
    • https://cdn-cms.f-static.net/uploads/4488315/normal_6049aa0cab7ae.pdf
    • http://nenonazuf.scienceontheweb.net/planes_y_programas_de_estudio_2011_secundaria_artes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muvarelo/zijetozofalisolasa.pdf
    • https://uploads.strikinglycdn.com/files/471c35a6-3f99-42d0-bc28-39b15ac57f6a/brother_electronic_knitting_machine_patterns.pdf
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_719283df793d439785d8354a1c5177b9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e0513d1f-9eb2-4291-9c7b-d5fdfbcec300/how_do_i_set_up_my_hp_printer_to_my_wifi.pdf
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_94d6a0270f8b401c951a925cb85d4093.pdf?index=true
    • https://s3.amazonaws.com/ganubifirigevi/zuforudivapajidakavavoxu.pdf
    • https://uploads.strikinglycdn.com/files/49c02efd-1ef4-47e1-9f95-c70fc869e45d/things_not_allowed_in_russia.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_off0000f7ca.bin
5e451399e05b6209a92bf968970c683545d5025675f108fbad27f0acda6cd846		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 5352 bytes
font_01_sfnt_off00010a17.bin
d5e54877f886c5c3c449235a6b5ac677e2618ab9c9bebf97a19d333322e486b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A17 10188 bytes

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