Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3f67b19132cf88…

MALICIOUS

PDF

89.3 KB Created: 2021-04-04 19:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b997cd5140b411c4eb8502e98eb27e02 SHA-1: 00df2fbc2dc238127c5cebf84fc4f2ce91421a2d SHA-256: 1f3f67b19132cf88509ce6f99d9ee9d931ae580bbbd354102c5f6709d76a961d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=bacterial+pathogenesis+molecular+approach+pdf+free PDF link annotation
    • https://fazokovonopa.weebly.com/uploads/1/3/5/3/135329702/de74684e51d23e2.pdfIn PDF document text
    • https://zoxopabetil.weebly.com/uploads/1/3/1/1/131163737/6319206.pdfIn PDF document text
    • https://vufobuvi.weebly.com/uploads/1/3/1/1/131163959/25c9eb4ac.pdfIn PDF document text
    • http://xekevixuvojiw.22web.org/xexutasolo.pdfIn PDF document text
    • https://revunisukigi.weebly.com/uploads/1/3/4/8/134849871/suvudilubuvegap_dunesilo_doduref_boxilasoxuji.pdfIn PDF document text
    • https://figowemepiwe.weebly.com/uploads/1/3/1/3/131398533/8055b8eacf.pdfIn PDF document text
    • http://limowoduramu.iblogger.org/video_lagu_tsunami_palu.pdfIn PDF document text
    • https://fudosabitewixo.weebly.com/uploads/1/3/1/6/131636852/kotul-wukedofosazo-litavulewo-wikagaf.pdfIn PDF document text
    • https://sajipetifejej.weebly.com/uploads/1/3/4/8/134883768/3515190.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://87d5e434-dc39-4d64-8681-877d64e204d5.filesusr.com/ugd/5660ac_514c678be4a046769a793a7022530bb5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d55524d3-71cf-464c-a560-56b77bce946d/the_boy_in_striped_pajamas_book_review.pdfIn PDF document text
    • http://putagasixebe.epizy.com/how_to_connect_phone_to_lg_speaker.pdfIn PDF document text
    • http://bumilamufitilu.epizy.com/learning_disabilities_types.pdfIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_7974de72d7a544f58e8033cbff2fd328.pdf?index=trueIn PDF document text
    • http://satekivu.rf.gd/acrylic_painting_tutorial_for_beginners.pdfIn PDF document text
    • http://sivuvupaxiju.rf.gd/52929659341.pdfIn PDF document text
    • http://rusakarazixano.epizy.com/45108498259.pdfIn PDF document text
    • http://rajimorix.rf.gd/78093037851.pdfIn PDF document text
    • https://76c87692-cca9-4651-be8e-de6412dad411.filesusr.com/ugd/fdad67_5b1c10f5ba84431ab77a7a1f8fc4da0e.pdf?index=trueIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_6c70024bd77544ef8ed3621886760933.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30bf02c0-cbe1-4460-af5a-5ee4c17c444c/35685303272.pdfIn PDF document text
    • http://vokamaluxofom.epizy.com/online_spoken_english_practice_tests.pdfIn PDF document text
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_7c4921c870464b0b9b5584a0a9b0c2da.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_off00011c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7C 5616 bytes
SHA-256: 70deeba97773d67fee88e49485f3d82ceba3ccad3b685b2e9c0c613a78cf0417
font_01_sfnt_off00012f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F69 11264 bytes
SHA-256: 49330dacac2a7e20cec6f57a9ba3f5feb33e3655add66dff8ba549fa357d7ee3