Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbb5bb6f4b66c7f…

MALICIOUS

PDF

73.1 KB Created: 2021-06-02 04:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e8853219bdfb6a1fff2c3a7e6a1ded6d SHA-1: 9f40ab5f2bf67c789fbab05da8d6a5f8a33ba62b SHA-256: fdbb5bb6f4b66c7fd373159df27aad6cef4b7619074e72fdc125cc85e515b76f
226 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The heuristic 'SE_MFA_LURE' suggests the content is designed to harvest credentials or session tokens by mimicking multi-factor authentication prompts. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://irlanc.ru/pbw?utm_term=how+do+i+reset+my+honda+crv+radio+code PDF link annotation
    • https://lobusejorul.weebly.com/uploads/1/3/5/3/135338183/15d237b.pdfIn PDF document text
    • https://menedusuwoguv.weebly.com/uploads/1/3/4/6/134699995/4544805.pdfIn PDF document text
    • https://gisidamuxifa.weebly.com/uploads/1/3/0/7/130775495/7135393.pdfIn PDF document text
    • https://pojazamajalo.weebly.com/uploads/1/3/4/7/134728500/silivubewize-rafewavidowizim-zematodazobejub-logurutebi.pdfIn PDF document text
    • https://vidanametok.weebly.com/uploads/1/3/4/3/134318125/xexuvavop-lamume-digonefan.pdfIn PDF document text
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/lusisapure.pdfIn PDF document text
    • https://jidegumot.weebly.com/uploads/1/3/0/7/130776526/b6c99a34b97283.pdfIn PDF document text
    • https://gumopukuzi.weebly.com/uploads/1/3/4/4/134481114/6ddc0df78e65afc.pdfIn PDF document text
    • https://pilitopamazi.weebly.com/uploads/1/3/4/3/134313639/26df7c47541af43.pdfIn PDF document text
    • https://zuwuwuxi.weebly.com/uploads/1/3/4/8/134883554/lepejav.pdfIn PDF document text
    • https://zitifulopesere.weebly.com/uploads/1/3/4/7/134722705/752975.pdfIn PDF document text
    • https://savigopomela.weebly.com/uploads/1/3/4/8/134886046/4879464.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/894ce430-9c0d-4565-be6b-b6fcc97bdaa3/exquisite_ribbon_bow_gift_cards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4c5542a-42f0-48fe-96f5-b0a5818a229b/mafotejorufilelitipabilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92fe7b44-895f-40f7-822a-53a3eba33400/flipshope_flash_sale_chrome_extension_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54a3fbf5-1d4a-43f2-a6f0-ba1d9b0c70df/conversion_kg_s_en_m3_h_eau.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca4105e9-77a9-4c48-87c4-3d3c812a37cc/what_are_the_major_themes_of_the_play_julius_caesar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52ec0936-1de6-461b-aa77-21dc9be559aa/79081965152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ce1af62-4239-4985-a91c-f6b72360dd48/77426619419.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_off0000e23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23C 5364 bytes
SHA-256: 0c2a492f4c82fe0a096a1f6b9ba7c9089a8dcc14e78eabd109181575e1269f8a
font_01_sfnt_off0000f463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 10068 bytes
SHA-256: 5eccdd2d81ffb67eb7e9959ca5b926875a848c5857190f6c334a768cc7a31d7d