Malicious PDF — malware analysis report

Static analysis result for SHA-256 84479eee9913b554…

MALICIOUS

PDF

82.1 KB Created: 2021-04-02 18:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f51006fd58468d670cacaa53d8eb1ce2 SHA-1: cb2d84ae97a0146842f63032ea844be83ab4cdf9 SHA-256: 84479eee9913b554b7e74b3e84e4fbb9763e0e4e53511bdbfa4b876e0d25d568
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO poisoning tactic. The presence of a critical heuristic firing for 'PDF_SEO_LINK_FARM' and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent. The document body, though heavily obfuscated, contains a keyword related to guitar chords, likely a lure to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://seumenha.ru/award?keyword=bohemian+rhapsody+guitar+chords+pdf PDF link annotation
    • https://xojolulodi.weebly.com/uploads/1/3/0/9/130969725/1398422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392237/normal_5fe92ab6b142e.pdfIn PDF document text
    • https://vuvuzuvikedatun.weebly.com/uploads/1/3/4/5/134529562/suzugigujugasedi.pdfIn PDF document text
    • http://zuwifipenabed.medianewsonline.com/alimentos_para_la_anemia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423715/normal_5fe1a88ddcf98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451545/normal_6015fdd8437c7.pdfIn PDF document text
    • http://lazotub.mywebcommunity.org/atresia_esofagica_fisiopatologia.pdfIn PDF document text
    • http://zafenoro.scienceontheweb.net/nikolai_gogol_the_cloak.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/sjcam_sj4000_air_4k_wifi_aksiyon_kameras_-_siyah.pdfIn PDF document text
    • https://nevutero.weebly.com/uploads/1/3/4/7/134716167/sunikagov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497131/normal_5feebb1f3a5ee.pdfIn PDF document text
    • https://noragunefide.weebly.com/uploads/1/3/1/6/131637841/7562512.pdfIn PDF document text
    • https://wunebometa.weebly.com/uploads/1/3/5/3/135314425/jaduwapa-zodinexol-rezomusega.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/f5456d9b-4d81-4133-bc51-c5e7ac64e6ee/psychology_david_g._myers_and_c._nathan_dewall_12th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5d4492b-3965-4679-ade1-740822516852/wings_of_fire_the_lost_heir_graphic_novel_read_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2c8eba0-c3a3-4912-8ff1-164879e37bf8/how_to_adjust_a_manual_boost_controller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e21f5b1-3e7f-4aad-8d35-f503ee23ea02/25254203831.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/burixepodizotaxizujomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc8851fa-671c-410f-b58f-5468e09360c1/what_is_a_rmv_1_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/228d1b59-fd00-402b-ae0a-a493ae65d1ad/sajujutidijuvumezaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00a217dc-8441-4b0a-9bd7-889e273d88ae/jubejiduxafi.pdfIn PDF document text
    • http://bivojeda.atwebpages.com/semimurorilapuxuwofa.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/bogilaweloxude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f54b5609-5706-4d20-ba54-b8d0c6842a98/how_to_reset_gopro_3_password.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/singh_is_bling_movie_filmyzilla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e73a71a7-35c2-4d33-b8b2-e7f3a64d986e/88274410202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d416d9ad-7536-47ae-9ea7-63a4e0ab1b7e/members_mark_hybrid_pellet_grill_manual.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_off00010293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10293 5688 bytes
SHA-256: 41ba2ad79c7349386fb769a8f7e85073eec76cdb0962fb6fa70183066ef64936
font_01_sfnt_off000115cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CF 10696 bytes
SHA-256: 4cfdbdbdfd5a9954128adb773dcea6e74e7ee3a55306f3151b0b0018ac00a335