Malicious PDF — malware analysis report

Static analysis result for SHA-256 856bf879db1598ee…

MALICIOUS

PDF

77.4 KB Created: 2021-03-07 16:56:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 042d5cda6c841ad48be732061b5b4883 SHA-1: 45aefcd1ddf5998eeef1b906168c1c52a30d51e7 SHA-256: 856bf879db1598eebe9cab1bbcb08eee1140469b62ec24228c7d1a38313f8c58
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs point to potentially malicious or deceptive content, likely intended to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • 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://xezojetit.ru/wix?keyword=a.o.+smith+promax+water+heater+manual PDF link annotation
    • https://rajezedej.weebly.com/uploads/1/3/2/6/132682549/barajebutonupuw-fuzopabili-bigutobaxeko.pdfIn PDF document text
    • https://fenorave.weebly.com/uploads/1/3/4/6/134639489/pezulatowegex_sifuzexogud.pdfIn PDF document text
    • https://rojuligu.weebly.com/uploads/1/3/0/9/130969709/divalukedog.pdfIn PDF document text
    • https://sizutipaji.weebly.com/uploads/1/3/2/3/132303075/6317304.pdfIn PDF document text
    • https://bufagigakumeg.weebly.com/uploads/1/3/4/3/134313452/2484164.pdfIn PDF document text
    • https://ferakatetimof.weebly.com/uploads/1/3/4/4/134470639/toviwegimuv.pdfIn PDF document text
    • https://pizakatunif.weebly.com/uploads/1/3/1/8/131856177/1289577c038a4.pdfIn PDF document text
    • https://kosilamegorigi.weebly.com/uploads/1/3/1/4/131409210/3671680.pdfIn PDF document text
    • https://murasujudadalox.weebly.com/uploads/1/3/5/3/135338307/ronowojuzovezix_welutatefa.pdfIn PDF document text
    • https://xesizoge.weebly.com/uploads/1/3/1/4/131452949/punubeze_witubi_bogofap_ruxonuzerezagix.pdfIn PDF document text
    • https://rasofenetiko.weebly.com/uploads/1/3/4/8/134862321/kagakedimiwiwa_xutixova.pdfIn PDF document text
    • https://fuborevotoxuto.weebly.com/uploads/1/3/4/0/134017795/baff0e69f199b9.pdfIn PDF document text
    • https://xisezuvu.weebly.com/uploads/1/3/4/0/134096300/gopud.pdfIn PDF document text
    • https://javubabajekav.weebly.com/uploads/1/3/5/9/135957287/kuwibobejitonivedibi.pdfIn PDF document text
    • https://motanufogok.weebly.com/uploads/1/3/1/3/131381166/6330cc.pdfIn PDF document text
    • https://sorasewemo.weebly.com/uploads/1/3/4/3/134358680/kepomuwarodof.pdfIn PDF document text
    • https://kokilanoru.weebly.com/uploads/1/3/4/0/134012510/pirotigopesiliv_dasob.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/a769d079-0a31-439c-b8fa-e21bad8d4c24/does_kfc_still_sell_the_double_down_sandwich.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/how_to_make_an_apps_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e293dc9-62ee-43ae-bab0-807c2be8391b/epson_workforce_wf-7510_all-in-one_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d7b9dee-6337-49b6-8eae-140135e4981a/81253204437.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/cisco_apic-_em_deployment_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/dujogowamotop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b40ef72-3318-453a-8a72-545db836e58e/how_much_oil_does_a_onan_4000_generator_take.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/45596791600.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_off0000f238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 5240 bytes
SHA-256: ad60e9addfecc764ca2721f3dcdd80dea3c41686d66ffb8c23f6c993aba6bd68
font_01_sfnt_off000103f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F5 10476 bytes
SHA-256: 7b5664dd667fad7128a5e473b0e6a7f21f96a5659b388c952def2bbc1300d8e1

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