Malicious PDF — malware analysis report

Static analysis result for SHA-256 675bfc11764ebbb2…

MALICIOUS

PDF

84.7 KB Created: 2021-03-29 15:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2ec8780e288ab7f9e5a2b3ffc8af5542 SHA-1: 5f51c260b038e3427a13b44adbebaf6a50aabb1e SHA-256: 675bfc11764ebbb266d884a355232af99342f74cd49796436edb2cc4109c2e9e
154 Risk Score

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. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=assamese+newspaper+pratidin+free PDF link annotation
    • https://metifipiwe.weebly.com/uploads/1/3/1/1/131164131/gakadefowuxewerurawu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459916/normal_604b2999be356.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373519/normal_5fed39d1cba9b.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/kuxololutebimot.pdfIn PDF document text
    • http://ellmax-site.xyz/644565303650yxze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_6026d9dc8f486.pdfIn PDF document text
    • https://borubonaxufiza.weebly.com/uploads/1/3/5/3/135318051/bufosus-rebuvowunifig-minotomoripe.pdfIn PDF document text
    • http://cashfree.store/kegibemrjb5z.pdfIn PDF document text
    • http://1green.space/best_ad_blocker_for_android_mobilenh91q.pdfIn PDF document text
    • https://rawiranuxox.weebly.com/uploads/1/3/4/6/134618620/7005637.pdfIn PDF document text
    • http://unreguezff.rest/why_is_my_samsung_tv_turning_off_by_itselfj0j0t.pdfIn PDF document text
    • http://logunesunoj.medianewsonline.com/macam_macam_agama_di_indonesia_dan_penjelasannya.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493597/normal_602adc6471d0d.pdfIn PDF document text
    • https://tokebezewala.weebly.com/uploads/1/3/3/9/133999388/zanojulubinemaru.pdfIn PDF document text
    • https://revininone.weebly.com/uploads/1/3/1/3/131380081/33867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489981/normal_5fd64ebcd080e.pdfIn PDF document text
    • http://sunmarkt.ru/jirosegiwovalawumo9tllp.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/julexekubaj/28532815719.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/4919521183.pdfIn PDF document text
    • http://wiwosotu.myartsonline.com/whirlpool_wmh76719cs_door_switch.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/guidestar_platinum_organizations.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/ddu_gky_guidelines_2018-_19.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 5236 bytes
SHA-256: 8f49b8a029f41af35b3edb7cecb2209d10161e0a6895681626e0b0a088267aa8
font_01_sfnt_off0000fb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5C 10940 bytes
SHA-256: 4ce3a6b578efd899639d50a53ca0fa631ce40cd6a818f8da0fbdff19df28afc1
font_02_sfnt_off00011dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC1 11572 bytes
SHA-256: d345969e07c210a8fbe1d36ecd02d0f10508226dd8f5db8a6fe25fcad0b217c1