Malicious PDF — malware analysis report

Static analysis result for SHA-256 15611a7365411908…

MALICIOUS

PDF

78.4 KB Created: 2021-03-20 17:30:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c25ad0f3adcfea93a2cec243304865d4 SHA-1: b42c9f39466a362202e48100fee6ed943e763679 SHA-256: 15611a73654119081a609f3e18143c42ed7bebd576f0ea20ae9d79101a1703f4
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, many pointing to benign-looking PDFs, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, https://pelibifir.ru/award?keyword=proyecto+de+grado+psicologia+pdf, is likely part of this scheme to drive traffic or potentially phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/award?keyword=proyecto+de+grado+psicologia+pdf
    • https://cdn.sqhk.co/kokademesuz/fYjhidy/farm_animal_sound_spinner.pdf
    • https://cdn.sqhk.co/keridola/jgkhggj/84891997497.pdf
    • http://nesakud.mypressonline.com/cell_communication_quiz.pdf
    • https://cdn.sqhk.co/kidimezamos/jghh9gc/92669751278.pdf
    • https://cdn.sqhk.co/nexetifosam/jaf6Thh/85916968217.pdf
    • https://cdn.sqhk.co/tilesoxeg/idibjhJ/mendeley_apa_citation_guide.pdf
    • https://genunilime.weebly.com/uploads/1/3/4/3/134344847/ef53257f7c4257.pdf
    • https://wexokoxenasebun.weebly.com/uploads/1/3/1/4/131406289/monexikewipepo.pdf
    • http://zozamowewideno.mypressonline.com/epidemiologia_livro.pdf
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/6036249.pdf
    • https://cdn.sqhk.co/wiparodub/S0Ppngc/kick_fruity_loops_download_for_android.pdf
    • https://dovavifedudefew.weebly.com/uploads/1/3/2/7/132710721/3c33f70967.pdf
    • https://cdn.sqhk.co/dozawulu/ggSghNQ/12362640457.pdf
    • https://cdn.sqhk.co/farafakilof/lhh6uhf/likert_scale_analysis_example.pdf
    • http://wugipesirexoxof.mygamesonline.org/peter_handke_justice_for_serbia.pdf
    • https://sawepaxir.weebly.com/uploads/1/3/1/8/131858353/2ff4f9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tubukeganuji/zebrafish_brain_atlas.pdf
    • https://s3.amazonaws.com/falufusu/lerodoros.pdf
    • https://s3.amazonaws.com/zasepo/logitech_touch_plus_wireless_keyboard_k400_review.pdf
    • https://s3.amazonaws.com/xazarujokemus/wodimanisezalamipuxinado.pdf
    • https://s3.amazonaws.com/nezanurugega/bafefuwutalugimika.pdf
    • http://likutolejit.onlinewebshop.net/vavikanojar.pdf
    • https://s3.amazonaws.com/sesijesule/16172928600.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f475.bin
9efeed67a96ba15efecfa9e33f83335ddd4c2bc3e26828f44a35a3aeaf9a8f6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 5428 bytes
font_01_sfnt_off00010705.bin
24dd43704619c43a2473a792d7c827f7f14e8f30ec3caed4444674c56a9d0e2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 10920 bytes

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