Malicious PDF — malware analysis report

Static analysis result for SHA-256 255ccfa6c1fd8d39…

MALICIOUS

PDF

107.0 KB Created: 2021-03-06 03:31:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c4a1286b9f610c65e958ef697c10eb9e SHA-1: 6b15f9c44c7ed565170251b7a85f6037ad708f00 SHA-256: 255ccfa6c1fd8d39f10c40a63493116086043d397217ccceb90e40b83dfdd3f9
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating it is part of a link farm, with numerous external links. One prominent external URI, 'https://xezojetit.ru/123?utm_term=how+quickly+can+i+get+a+pair+of+glasses', suggests a lure to a malicious website. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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.
  • 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/123?utm_term=how+quickly+can+i+get+a+pair+of+glasses PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4492871/normal_5ff0e33626185.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419225/normal_602f6b56d1a36.pdfIn PDF document text
    • https://zejenabo.weebly.com/uploads/1/3/0/9/130969472/nifugurezesidav-fapofinedusaweb-wobitojifa.pdfIn PDF document text
    • https://winojarenegesut.weebly.com/uploads/1/3/4/4/134481716/wukab-pufazep-nixoga-detopizapudun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374963/normal_5fc98a740239a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/donarepemi/powapegidamoxijifog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdf50316-5143-4bd9-96e1-1492d3c2b249/alla_prima_tattoo_ink_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a90505bd-6dd4-48ec-9339-e85734aa3298/how_to_get_error_codes_on_kenmore_dishwasher.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/93074502870.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/balance_general_proforma_paso_a_paso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bbdd83e-b128-4f4d-863f-59e86a623545/puforenuxojirelef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7813fa58-f462-4370-877b-86174e284c8a/85048199608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7f46be6-1df6-4492-803a-a9dafec93673/sample_personal_essay_for_college_admission.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/android_bixby_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94d2b844-9e5c-4602-9240-f2588650ede3/what_tools_do_i_need_to_detail_a_car.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cd6112f-aa67-44dd-a471-4fd551d7b299/miladewadadewerepozeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4512a12-877b-48eb-ad5e-ee3f102a1ee8/26328213665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b33576b2-1d26-4d2e-a228-ee854036cb87/pidiperekirofaniw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed1c24c1-2c61-40e2-8797-04426c2ea890/luwarakodaxulaluz.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/pengaruh_letak_geografis_indonesia.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/tanuvuzepotuwudinajafe.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/cannondale_topstone_sora_size_guide.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F8D 5528 bytes
SHA-256: 8db6b60dfc9757ad2cf22359543b7144d4bd2e304150fff1d2beb74ed9c33ad2
font_01_sfnt_off0001728d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1728D 12332 bytes
SHA-256: 727b1aa163ee354811c9f5ed684a270230f17e017d6100a93d4a0303e80fd84b

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