Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1864a3b08a15828…

MALICIOUS

PDF

84.4 KB Created: 2021-03-18 04:45:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 907abe92cee9d830c3dcb8f16ae24c95 SHA-1: fecd9dd61fd12c759bc0abc6160e59b7e43fff49 SHA-256: d1864a3b08a15828e32ce54a4fdaa13682f9fd7beb8d8308d4006005ae9b7df9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://jottigo.ru/123?utm_term=conceptual+physics+workbook+answers PDF link annotation
    • http://onlinetyz.xyz/65213344661h1an8.pdfIn PDF document text
    • http://umkatrade.ru/654139818603k05z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486534/normal_600809b18cbbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471513/normal_5fdfc84e0be43.pdfIn PDF document text
    • http://gladkoe-telo.xyz/740381605753yeh2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419818/normal_5ff5e183c93f7.pdfIn PDF document text
    • http://ourfanz.com/raxelegitanujageabe5.pdfIn PDF document text
    • http://hesap-al-sat.com/jual_dough_sheeter_bekasuz2c6.pdfIn PDF document text
    • http://losinglotterynumbers.com/how_to_fill_form_d_memorandum_of_marriage858cs.pdfIn PDF document text
    • http://azakalaza3.xyz/asus_maximus_viii_hero_z170_specsu54pg.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/fizup/salaam_rocky_bhai_song_status.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a112eb35-c689-47ed-8f17-5ca4b406c851/evenflo_maestro_booster_car_seat_installation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77d074fa-7e06-41ba-a898-c236ea712765/skyjack_sj3219_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/pevelopakivigamewumurebax.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/what_is_world_literature.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0f994b2-c5d5-4d75-8606-18463fd1a448/4070715344.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97a84bd9-6aa3-4618-9e63-16a844d7e0e1/best_way_to_build_a_magic_the_gathering_deck.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/109a0fbe-0a28-470a-a592-f1fd897dd21d/que_es_un_bosquejo_de_investigacin.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/mickeys_caps_answers_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61138d27-6c39-409f-aa32-f40b0b40ce3c/nordictrack_exp_1000x_treadmill_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/122c3487-58a8-4a3c-a2f4-fa0e31976b74/gikifemes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80c68dbe-ae9a-4153-8527-81167f99679d/47003265051.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93b69f2f-e795-4468-852d-9d6566088d35/78972615615.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/dfa_passport_application_form_for_pwd.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_off00010c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4F 5324 bytes
SHA-256: bad5f6b9a5bc74a0e521d0886e95d19ad7c50f8a16334257235c1538661b1e59
font_01_sfnt_off00011e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6F 10664 bytes
SHA-256: b800c0b0d705147f357473da0d10b867b695e65407c6c1a77cbf27057a8d0152

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