Malicious PDF — malware analysis report

Static analysis result for SHA-256 b760132dadf14f91…

MALICIOUS

PDF

78.8 KB Created: 2021-04-16 08:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a79b0c580f14bd28dcec45e3f87655f5 SHA-1: 1cf959fe87819a01b33fb57501bc3e6ec079d6d1 SHA-256: b760132dadf14f91ba74f1826dd93b90a3e5cefa488ea2f88a13678a39e0e6a6
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 0.9957

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://nipisod.ru/strik?utm_term=what+is+the+definition+of+the+word+economic+system PDF link annotation
    • http://sumigemag.mywebcommunity.org/morexekazubijofowomoru.pdfIn PDF document text
    • https://rakositove.weebly.com/uploads/1/3/4/5/134595637/39fc94ba7bf13bf.pdfIn PDF document text
    • http://nutosuvitiraj.scienceontheweb.net/what_is_the_difference_between_grand_piano_and_upright_piano.pdfIn PDF document text
    • https://tezenilul.weebly.com/uploads/1/3/6/0/136085996/kekijemapaxovo.pdfIn PDF document text
    • http://kijumubafenu.mypressonline.com/what_i_wish_i_d_known_before_marriage.pdfIn PDF document text
    • http://wamuwosola.mygamesonline.org/dumozopidusewifota.pdfIn PDF document text
    • https://xopezafetuwov.weebly.com/uploads/1/3/5/3/135314897/dd1b7eea395cfc4.pdfIn PDF document text
    • http://tofugezupeb.mygamesonline.org/mizikal.pdfIn PDF document text
    • http://sudiwemubitep.22web.org/81080942070.pdfIn PDF document text
    • http://lisuzigerob.mygamesonline.org/65249085808.pdfIn PDF document text
    • http://gixofufivexofu.iblogger.org/nopibar.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/1679394c-50ff-436f-bfb6-a3b5352036ee/zabovaj.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/zetefotadedaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc25c010-639c-4b9d-ac6e-5ae0f939478c/34261689803.pdfIn PDF document text
    • http://duxepivol.myartsonline.com/definition_of_manager_and_leader.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/apartment_address_format_in_spain.pdfIn PDF document text
    • http://zeteximezoxa.myartsonline.com/8897778469.pdfIn PDF document text
    • http://pikididubemet.epizy.com/43388490343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc2fc028-71d8-4b43-9406-0e799f3c0e5a/81874617848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca10b7da-621a-478d-8c3e-c7f02c4ca7dc/wolegofotirutem.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/70176681520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f30d9ce7-4adf-4851-bbb4-c0d6ff692703/69450023874.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/34637749064.pdfIn PDF document text
    • http://kewetanetoza.atwebpages.com/gatedaridujuzufev.pdfIn PDF document text
    • http://pupiloxesafefiz.epizy.com/wix_adding_header_code.pdfIn PDF document text
    • http://natunolujekusi.epizy.com/applications_of_mathematics_in_geology.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/what_is_the_bolt_pattern_on_a_2000_jeep_grand_cherokee.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_off0000f814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF814 5436 bytes
SHA-256: 0c9532f977f23ea29d4cd73685c77a240b96ebc385234631b620b68951a0e5ac
font_01_sfnt_off00010a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A80 9936 bytes
SHA-256: df36aba75f86e35e2531571a500779eb61791d0996f85a3868accc68cbbc2e6f

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