Malicious PDF — malware analysis report

Static analysis result for SHA-256 400aaf937be722fd…

MALICIOUS

PDF

104.5 KB Created: 2021-05-20 21:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 023203a8fc7a95bafb817fbb01eacf72 SHA-1: 019bd1348775a1aa60eb9e02e371263a6e3d3aa6 SHA-256: 400aaf937be722fd7a14fdc27b74a3f2cb80612bd1750367bdcb53f5b16efd91
186 Risk Score

Malware Insights

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

This PDF document is classified as malicious and contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The heuristic PDF_SEO_LINK_FARM indicates a mass of external PDF links, and the ML classifier strongly flagged it. While no scripts were explicitly extracted, the presence of numerous external URLs and the overall structure point towards an attempt to redirect users to malicious or deceptive content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/wb?keyword=house%20of%20cards%20monologue%20script PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4444649/normal_5fec51f86b884.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495686/normal_5ff54143f2a54.pdfIn PDF document text
    • https://lumakevapex.weebly.com/uploads/1/3/5/3/135311332/2852502.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417205/normal_5fe4e774548e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388160/normal_605553f12a2fe.pdfIn PDF document text
    • https://xikaxuroloxo.weebly.com/uploads/1/3/1/4/131406092/sidepovaviwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374953/normal_6013145e71435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392867/normal_603034f9a103c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450512/normal_5fcc13f629f4f.pdfIn PDF document text
    • https://liberiloro.weebly.com/uploads/1/3/4/5/134589576/7aae948c843760d.pdfIn PDF document text
    • https://nojemalof.weebly.com/uploads/1/3/0/8/130873850/kesivobik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e1afb7e-cc46-4bee-9305-0fd8dba770a7/percy_jackson_and_the_sea_of_monsters_summary_shmoop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a0605d8-17eb-405e-b8d0-75976b74e852/why_does_my_ue_boom_have_no_sound.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/nodexikixivamawu.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/tedelotobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55cdfa54-a243-4e4a-a746-ab9104d2fbbb/how_do_you_fix_a_dishwasher_that_doesnt_fill_with_water.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ffbe814-c381-4718-b2af-09e9e5460950/problemas_matematicos_de_5_primaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cabb6470-572f-40d1-b60a-feed9697d467/how_to_read_the_financial_statements_of_a_company.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/11738040166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/048137b9-8586-4092-869e-95d8f0e2ac5d/fibumer.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/nukiferusidimajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee4c9153-4e37-49fe-9369-99d0ba5703cc/6643482837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0771d57-6fe9-45a3-a548-57fea2bf1801/what_to_say_to_comfort_someone_who_is_stressed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87d8db24-53f2-4493-a4e8-783e89c07072/how_to_calculate_food_cost_percentage_in_a_restaurant.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CFE 5436 bytes
SHA-256: 7e7195131335467bad96b61f64a86b044c2902582a19edbe4ed6e936e3029818
font_01_sfnt_off00015f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F63 3152 bytes
SHA-256: d0d2cbb3c0be40a526c81c3f9c37f258e751b91624a59e3a93395cfb1e89724d
font_02_sfnt_off00016c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C21 11720 bytes
SHA-256: 4eb2ed38e2201beb2a17bac905deea4207189d917c6f59f0555749296506b66a

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