Malicious PDF — malware analysis report

Static analysis result for SHA-256 331b2291e65334d4…

MALICIOUS

PDF

79.9 KB Created: 2021-05-24 07:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: df15641fc0f738dbe0ee3feb37accc31 SHA-1: b0b718262473eb2c30569d70f5752760a02d1a84 SHA-256: 331b2291e65334d4e136ae7003a8acd1a5bc501ae84e9eae1829a5a884ed5329
244 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed to lead users to malicious sites. The document body, though partially corrupted, suggests a lure related to 'Peliculas de baile hip hop', likely a phishing pretext. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=peliculas+de+baile+hip+hop+completas+en+espa%25C3%25B1ol+latino In PDF document text
    • https://kagesurofuzesik.weebly.com/uploads/1/3/5/3/135303772/5969438.pdfIn PDF document text
    • https://tonefomemozev.weebly.com/uploads/1/3/4/4/134458928/wenijawu.pdfIn PDF document text
    • https://redelonoxoti.weebly.com/uploads/1/3/1/6/131606094/fepikefobigazesibupa.pdfIn PDF document text
    • https://dorigobumin.weebly.com/uploads/1/3/1/3/131384291/bebixasibor.pdfIn PDF document text
    • https://bewejagaseti.weebly.com/uploads/1/3/4/7/134708857/vokize.pdfIn PDF document text
    • https://senekidus.weebly.com/uploads/1/3/2/7/132740533/sedawa.pdfIn PDF document text
    • https://bopenuxot.weebly.com/uploads/1/3/4/6/134667357/8137380.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/varoximu/61313141056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2a3f4c7-a7a3-47ea-a141-c382bde8784c/how_to_write_a_motion_to_set_aside_default_judgement.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/zusisitezegusedaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5347d4f1-a786-4744-94fa-2df856d1404a/90158026184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00eb613f-b11a-451a-b2db-498b77345bf9/lijurelozasufivoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f7af85c-fcde-48c2-8c04-265c5f245fb8/21069522038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1049c6ef-afea-47e6-bb37-f936d8e4aeb5/how_to_destroy_electronic_medical_records.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b76ceeea-7cfd-489d-81ae-7986bc49ed5a/53875379975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb48a77b-dc63-4cbc-affe-5955664ea54e/marvel_contest_of_champions_4_star_hero_crystal_shards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7d83ab4-969d-450f-9348-a3b868c1071a/choose_your_own_adventure_house_of_danger_board_game_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f1722c3-a4e4-42ab-bd79-5a18ad166862/sureredimodibetasos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8180ae02-6447-4bdb-8874-275e9981a8ac/acer_chromebook_15_walmart_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94173c0a-3bc3-4949-9a00-5f759a447699/mewapilugasotu.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/gucci_belt_bag_size_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80905c9d-c945-46e5-bc46-b27c16fa9a46/65292820023.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c968362e-57f9-42db-8eb7-9c3c200d59b5/lureziwupilerozatax.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/dgs_d_full_form_in_railway.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_off0000f975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF975 5572 bytes
SHA-256: 630328538fa5f114fb4487a1dada6abc0f74a6a440e16cd17aed0fdf41e928c4
font_01_sfnt_off00010bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF6 10820 bytes
SHA-256: 0da992c2611ecfb2472fe87c03f19355592dfc9fb8f6f4d8323ac68a8a5f9b73