Malicious PDF — malware analysis report

Static analysis result for SHA-256 4672f81ac5c36c63…

MALICIOUS

PDF

80.4 KB Created: 2021-04-28 16:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f24ff7a24497c6951a9e6dbc499abf8d SHA-1: 2343293deca89e999a2aa8e73e1d7c369c650011 SHA-256: 4672f81ac5c36c635f17a7fa85d8cc5ce7b96ef853156ff797e149b10c6e0f4e
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The embedded URLs suggest an attempt to direct users to potentially harmful external sites, possibly for phishing or SEO manipulation. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+many+calories+in+an+arby%2527s+roast+beef+classic In PDF document text
    • https://ximixejolulozo.weebly.com/uploads/1/3/4/3/134351986/rakotuzumijetos.pdfIn PDF document text
    • https://vowexigap.weebly.com/uploads/1/3/1/6/131636774/6592740.pdfIn PDF document text
    • https://cdn.sqhk.co/nigalasiline/jjcibCv/vexed_meaning_in_the_bible.pdfIn PDF document text
    • https://tibaxasunoz.weebly.com/uploads/1/3/4/5/134589804/9598316.pdfIn PDF document text
    • https://birisudim.weebly.com/uploads/1/3/4/4/134467091/9261332.pdfIn PDF document text
    • https://juvosibizojeguw.weebly.com/uploads/1/3/4/0/134040958/sinesofuwinigolil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454289/normal_6023d168a417c.pdfIn PDF document text
    • https://cdn.sqhk.co/wifilivemij/cBghWnq/womawurer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_604f986565b73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390383/normal_60145465dfbb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459482/normal_5ff06af5b9a9f.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/h6Iiiii/rasabufinafodonorabiririf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474977/normal_604068e322b3d.pdfIn PDF document text
    • https://xukoperupe.weebly.com/uploads/1/3/4/7/134743664/47010.pdfIn PDF document text
    • https://balolemarivapi.weebly.com/uploads/1/3/5/3/135309218/dasopuxevafazevi.pdfIn PDF document text
    • https://cdn.sqhk.co/kulizuxekume/uJa6ih7/jaboporu.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/diePgdE/30910470408.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_cb8be2ded74f4d0098b332a185fd7820.pdf?index=trueIn PDF document text
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_94102d5f19b845d798e2eb2e12f38811.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d2b102f-108e-4bcb-aadd-723931557707/sajuxefujeg.pdfIn PDF document text
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_1a00b3907293467588550afad09a1eac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd208435-78fb-46fe-bd4b-eda193408668/service_manual_hp_designjet_500_italiano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06a08c55-ffd5-45d4-b90a-914097e82af7/miparafebabukena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73fde220-2c37-4318-9a47-0ac4b87fe67e/sezizakaki.pdfIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_009f661e931245d1bc4e72dcfce06986.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE5 5144 bytes
SHA-256: 51df56694c84f97d66d031928858555f866b80a28dc2494e2fc7750f318b3ab8
font_01_sfnt_off0001015a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015A 10760 bytes
SHA-256: 74a88999c3fe2278401db0c2f146c95cf4bf7707414a50ef8e583f97ffbd5dcb
font_02_sfnt_off0001261f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261F 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71