Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e7a1ba5bf9b0d00…

MALICIOUS

PDF

79.0 KB Created: 2021-04-15 05:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 7c176c2f2fc1fdcedf0051c548ac269f SHA-1: ecc35b44130102da73a233ef9b60d8537b3ab806 SHA-256: 5e7a1ba5bf9b0d0089ec34c209578cf9ade4a1995c259333ace372d99fc1ee06
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classification and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. The presence of 'utm_term' parameters suggests a phishing or SEO-based lure to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=average+grade+point+average+australia PDF link annotation
    • http://weridif.medianewsonline.com/dawezufasumozixepaz.pdfIn PDF document text
    • https://buderenedisam.weebly.com/uploads/1/3/5/3/135302361/7477703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421788/normal_602711d317a85.pdfIn PDF document text
    • https://tulosiwawi.weebly.com/uploads/1/3/5/3/135326734/xizawizobexozusuzoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484355/normal_5fc8a1dadc0a3.pdfIn PDF document text
    • https://musuvawe.weebly.com/uploads/1/3/4/5/134528527/tosufozaxukeza-kuleforek-rakogavo-xerolibuge.pdfIn PDF document text
    • https://vasalidut.weebly.com/uploads/1/3/0/9/130969475/1825722.pdfIn PDF document text
    • http://fesalasan.mygamesonline.org/hanoi_map_download.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/1298050.pdfIn PDF document text
    • https://bozelisu.weebly.com/uploads/1/3/2/6/132695328/belidisifupuburigepu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369932/normal_602195618ff69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wenulusevikofa.myartsonline.com/botaxozijerina.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/jandy_aqualink_rs_troubleshooting_manual.pdfIn PDF document text
    • http://kapirexazi.onlinewebshop.net/chapter_1_research_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/how_to_delete_talk_to_me_in_korean_account.pdfIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_0e639f16f58b4e5f8dc4839a55c9f770.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/90586752337.pdfIn PDF document text
    • https://00f02ae0-031c-4cf4-85c3-86bbc6d7deb2.filesusr.com/ugd/13f2e4_2a8ae9c835074dcb8886276dced74def.pdf?index=trueIn PDF document text
    • https://1a899ca6-11bf-4464-971e-4bf0b885e765.filesusr.com/ugd/4ac3ff_3e16537849df475c97e2d8ec38461807.pdf?index=trueIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_ba49b495bbe34e58a57341227b57944b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/fronted_adverbials_worksheet_year_4.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/kewerumulakeduvifudode.pdfIn PDF document text
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_ce2bd5a381024653bf57a3ebfbaffcf7.pdf?index=trueIn 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_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 5176 bytes
SHA-256: 705e668df48880d15db1ccc7689b0c5f5f95dbb4bcee2401feef53f9090fa467
font_01_sfnt_off00010603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10603 11284 bytes
SHA-256: 59afef3a8ec03615ab43132e5f7e1a3c070adb00324519a5364a9b5a17134f07