Malicious PDF — malware analysis report

Static analysis result for SHA-256 257e689fa2dab2c7…

MALICIOUS

PDF

83.1 KB Created: 2021-03-23 14:01:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5bb56b9ac7cc576efddea4873dcd2e25 SHA-1: c3200f3eee45a60dc9b217e1f781ff6a731e6984 SHA-256: 257e689fa2dab2c780d45f34b81179f7f6a7b4eef9fd227b5e52fde396be7c20
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external URLs. The ML classifier and ClamAV also identified it as malicious. The primary purpose appears to be directing users to a network of sites, potentially for SEO manipulation or to host further malicious content. No scripts were extracted, but the presence of numerous external links suggests a phishing or redirection attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/award?keyword=minions+language+pdf PDF link annotation
    • http://pararapameso.getenjoyment.net/besame_mucho_classical_guitar_tab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450047/normal_5fde1fa930fb5.pdfIn PDF document text
    • http://rumafelaneli.mygamesonline.org/abbyy_fine_reader_to_word.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366014/normal_604df2de3f7b0.pdfIn PDF document text
    • https://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/mosilutunulaburefe.pdfIn PDF document text
    • https://bunivuwavimi.weebly.com/uploads/1/3/4/7/134706582/pilub.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/cable_gland_price_list_2020.pdfIn PDF document text
    • https://fuzipoxo.weebly.com/uploads/1/3/0/8/130873840/xibufunamilux_nalafu_palatazibutaka_rituw.pdfIn PDF document text
    • https://gelixilononusi.weebly.com/uploads/1/3/0/7/130775878/7358091.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/98d46753-dc9d-420a-a2e7-dbffd0de77c0/baby_trend_navigator_lite_double_jogger_stroller_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5378d3b1-b76a-49ab-b266-839ded6eeaaa/asus_rt-ac88u_repair.pdfIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_0c75508b90884611b52a5806493961eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/456f673a-8915-4769-a775-c16bb521e034/40071835739.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a32b412e-3bb9-40db-863e-df786c32a5d4/hp_deskjet_ink_advantage_2545_driver_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d1bbfe7-0989-4366-b75a-24417392fe0c/bertrand_russell_the_value_of_philosophy_essay.pdfIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_66feb0fcabd7406c91576fc29655c7b4.pdf?index=trueIn PDF document text
    • https://b81f28a7-a6cc-4df9-aebb-a76b708ee4b5.filesusr.com/ugd/df05b2_3e064f8eb258442a92aa1f8d04c635d2.pdf?index=trueIn PDF document text
    • https://76b44699-1094-4fd8-8d4a-70b7be8159c3.filesusr.com/ugd/c450b2_2247c383d7b34f05a5b4390b758ab91b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f5f8abe-7386-45be-9a97-4b0f95bf9ecc/dotorunutekotibizonapunuz.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_off0000eea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 7064 bytes
SHA-256: 8b04fc9788b0e1bdca720581ef5fdde0a6fc42fe8c5bda7c96995c064ce56fd9
font_01_sfnt_off00010728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10728 5116 bytes
SHA-256: 4c8e6fee754f46663421bd34dfeb930360d7a940e34a603a5e410a4025b3157f
font_02_sfnt_off000118ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BA 11852 bytes
SHA-256: 5668bcedaf1e581c95220c433f398496288b81ecb79ba41738b1094050d06552