Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e7827b0d4c60cd…

MALICIOUS

PDF

75.0 KB Created: 2021-06-01 17:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 793be408fd2d15fd80d932328fa0d0c5 SHA-1: ba3fa7265d892b4e0b69da49fc8ff4a190b849e1 SHA-256: 26e7827b0d4c60cdf1ed947138e42374a08666706d8af72d8c2cf39eda5da601
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm designed for SEO manipulation or phishing. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this. The presence of a QR code lure and a visual download button further supports a malicious intent to redirect users to potentially harmful content. ClamAV detection and ML classification confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/pbw?utm_term=whatsapp+desktop+windows+7+64+bit PDF link annotation
    • https://xenolato.weebly.com/uploads/1/3/4/8/134868471/vuzilaruwa.pdfIn PDF document text
    • https://wizenojozus.weebly.com/uploads/1/3/4/3/134319480/gipubisawemu.pdfIn PDF document text
    • https://samarobiratepiw.weebly.com/uploads/1/3/5/3/135327643/rekiterowepozef_jadawefebesi_fanirulu.pdfIn PDF document text
    • https://mopuzivukoman.weebly.com/uploads/1/3/4/1/134108623/tisadarufulanes.pdfIn PDF document text
    • https://mijonezogiju.weebly.com/uploads/1/3/4/3/134308960/1578a845a0.pdfIn PDF document text
    • https://vavuloxen.weebly.com/uploads/1/3/0/7/130738497/rewegiwisebavun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://barumena.pbworks.com/f/15527132016.pdfIn PDF document text
    • http://ravowibosu.pbworks.com/f/what_is_a_sensory_imagery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/816ddeae-012d-48a0-a4e9-66f882cc9e2f/mba_cet_question_papers_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfa72804-e977-4bbe-b110-e2e94546d363/casio_lk-175_ppk.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/adobe_creative_cloud_uninstall_command_line.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/voice_lessons_syntax_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/621a17a5-6ca2-4b61-8274-d9ff6776c00c/the_expanse_wiki_episodes.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/john_deere_425_mower_deck_belt_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7527473-7ce0-4dda-ba1f-69132b88a8c7/how_long_before_red_light_therapy_works.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f78ee4-0858-4432-9d11-78b85cfc55ce/text_structure_meaning_in_english.pdfIn PDF document text
    • http://tejudafo.pbworks.com/f/72462351626.pdfIn PDF document text
    • http://bupataved.pbworks.com/f/free_gem_generator_for_clash_of_clans_no_survey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/901eeaa4-7f2e-4350-89f6-09df8c7939c2/dyson_v12_release_date_australia.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_off0000e572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE572 5548 bytes
SHA-256: a2b87d9534557ddfe81395598b53f4ab1f2643f056e91727fee4538b43ce490c
font_01_sfnt_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 11816 bytes
SHA-256: 7ad4706485317073c0b2cd1391ccc9078f0c21b0f8d9ea38dcb242ac1587d80d