Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62870d9076f1e71…

MALICIOUS

PDF

75.2 KB Created: 2021-03-12 17:20:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 608be5d237bb84484e6774b29ff7f5d2 SHA-1: 348b51ca2c51afd799ebc8a47f832a08c9e71a76 SHA-256: c62870d9076f1e716187375baa27c3791ae2dded66f2ac6f2ba784deedd6e7b2
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on link farm domains, indicating a SEO-based link farm attack. The primary URL, 'https://pelibifir.ru/award?keyword=array+programs+in+java+examples+pdf', suggests a lure to disguise the malicious intent. ML and ClamAV classifiers strongly indicate maliciousness, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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=array+programs+in+java+examples+pdf PDF link annotation
    • https://xijofufakeziti.weebly.com/uploads/1/3/1/3/131380729/27b668d1a.pdfIn PDF document text
    • https://fuwemuwiwogul.weebly.com/uploads/1/3/4/0/134016804/705ffd471a78081.pdfIn PDF document text
    • https://cdn.sqhk.co/wirubetena/btiaxAy/electric_wood_hammer_mill.pdfIn PDF document text
    • https://zawibovime.weebly.com/uploads/1/3/2/6/132681883/2c6ded73222.pdfIn PDF document text
    • https://cdn.sqhk.co/xaderipamuva/2Ufjfia/cartoon_farm_animals_clipart_black_and_white.pdfIn PDF document text
    • https://cdn.sqhk.co/sejejajoxej/idhf8zP/samsung_s3_email_setup_authentication_failed.pdfIn PDF document text
    • https://cdn.sqhk.co/pulisamog/e6l2wif/ace_academy_black_flight_mod.pdfIn PDF document text
    • https://fobepomakiroka.weebly.com/uploads/1/3/0/8/130874330/kulol_sipomemepim_vumexazo.pdfIn PDF document text
    • https://cdn.sqhk.co/laxefotogulo/dghuDgd/79213164670.pdfIn PDF document text
    • https://cdn.sqhk.co/jategumeb/ImhiFUk/27762318671.pdfIn PDF document text
    • https://cdn.sqhk.co/tejurorado/YjhiGii/define_dictatorship_in_a_sentence.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/iiIIzz8/rankin_bass_hobbit_soundtrack.pdfIn PDF document text
    • https://cdn.sqhk.co/wanevakaxuma/fNajhA8/dc_comics_superhero_movies_in_order.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/muxozuvalubi/evermotion_archinteriors_vol_30_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a8e43f0-6d58-451a-b853-926fbbe0c41c/dream_interpretation_book_wong.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf8a91b-3d15-4ef5-9601-03287ea517c9/nolagipunegemejefajanulen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a511e36-0e85-4c61-91f7-018ff9a505c4/rajagexasik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1977a03f-58a3-4f0a-9140-290bb5dc6396/87790880444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97e987f3-9d9c-4126-ab03-e374a57e0f4d/dell_precision_m4600_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d5bd617-e97c-4a81-a599-e7e70c862a61/fikufubibalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69c3ffaa-f45b-4d97-bdf3-41f4d0737799/gowutuxemunid.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/canadian_visa_lottery_online_form.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/kaxog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/972dfcad-66ef-46d2-a9d3-72b887ad2111/how_does_an_ac_unit_produce_heat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/101ffabb-f38f-4ff3-831c-976a22c37cb5/bubutuni.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_off0000e84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84C 5656 bytes
SHA-256: 0bb75b7c37542fc6cc7f1521b5e95a1455ec9d61d76297386a4df77211818dc9
font_01_sfnt_off0000fb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 10468 bytes
SHA-256: 013f97486f841cc567a83ff5719fbfd2b3a953c70b692891348a563a309e1757