Malicious PDF — malware analysis report

Static analysis result for SHA-256 53404e1c44869803…

MALICIOUS

PDF

80.3 KB Created: 2021-04-03 20:40:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a98cca9cdae5b3b80b0d7cd54149f1eb SHA-1: 7a1f45c6a3588bbfbadefebca485efde8b43e021 SHA-256: 53404e1c44869803c174cba9df1e5d3f426f9a3dc23b1c7c59f6bca592818584
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external resources, with several identified as malicious redirectors or part of a link farm designed to distribute malware. The 'SE_INVOICE_LURE' heuristic suggests a pretext of an invoice or payment request to entice users to click the links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of vulnerabilities to execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://dafemum.ru/award?keyword=accounting+ratios+examples+pdf In PDF document text
    • https://boxatikavizag.weebly.com/uploads/1/3/4/6/134680825/bowotugiliduxoxusaf.pdfIn PDF document text
    • http://white-x.fun/blacksmith_lab_hacked_unblocked_at_school6u1sw.pdfIn PDF document text
    • https://bexudedumazises.weebly.com/uploads/1/3/1/4/131406785/zitiguxofelewev_jarawimexixubu_kefep.pdfIn PDF document text
    • http://olymptrade.buzz/waguwasitokosirugajomefov9vgh0.pdfIn PDF document text
    • http://english-10.site/polugixevutefoxodah9xz0.pdfIn PDF document text
    • https://kuvinonufero.weebly.com/uploads/1/3/4/3/134307364/5975305.pdfIn PDF document text
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/katojejux.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/zidenigad/cub_scout_bear_handbook_addendum.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/elsword_dimension_witch_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce23e1dd-340a-4390-9b9a-b8fb3e39b790/pigalulinopasidojizu.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/it_s_a_girl_banner_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/45193278264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4255572-3417-4f70-a4d1-d58ae25b74f5/how_to_use_tegrity_on_connect.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/how_long_to_pressure_cook_boneless_beef_ribs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/179ab8ae-a224-48ea-876a-f9bc68c84d6d/harrisons_principles_of_internal_medicine_book.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/lebudusa.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/whats_the_difference_between_oral_b_1000_and_3000.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/music_sheet_with_letters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcfa8873-517d-4001-a84a-e3b2f694ed3f/zafegokaseparu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/730ded79-ecb1-4088-b02e-82440a162ea0/alto_shaam_food_warmer_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ae9f841-2cdf-4cff-a6a8-f60590931339/baixar_driver_scanner_epson_gt-s50.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/penomelesaxesudiwiretovik.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/woh_pehli_baar_full_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d494d4a1-7c15-44dd-9eb4-0287e7a4b0c6/collins_dictionary_english_spanish_online.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_off0000fadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADB 5532 bytes
SHA-256: 9c3ff5275355cded762eb778f2fd4ffa04bcf3cec792ab6b8fdb2a93b69bc54f
font_01_sfnt_off00010da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA0 11204 bytes
SHA-256: 9a993d6e5fd073550e49106f9f37429cea2df692d90180dc16f0e2f2e2a130c4