Malicious PDF — malware analysis report

Static analysis result for SHA-256 b542d319ea5ee4f4…

MALICIOUS

PDF

132.0 KB Created: 2021-03-06 09:00:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 602cebc228dfe6fd145cbbe1d5ec0e79 SHA-1: 09580352a723c64b1adb9b41783670fe9a5a3a41 SHA-256: b542d319ea5ee4f43117968362181a102c4c4ffdaf62c8ed4ac996242a189722
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain metadata related to computer hardware, likely serving as a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xezojetit.ru/award?keyword=optiplex+gx620+cpu+list PDF link annotation
    • https://newekozowoni.weebly.com/uploads/1/3/0/7/130738578/rugitaborizi-sezigevu.pdfIn PDF document text
    • http://umdtheatre.ru/jakisonupedunedimedokb25y.pdfIn PDF document text
    • http://barbanapoli.moscow/water_race_3d_online4ksey.pdfIn PDF document text
    • https://dowolozudatu.weebly.com/uploads/1/3/4/0/134000293/vuwuxikof.pdfIn PDF document text
    • http://allroadkamchatka.ru/taurus_millennium_g2_9mm_magazine_loaderj9eqe.pdfIn PDF document text
    • https://cdn.sqhk.co/posukomokufi/iajjb5g/rejipupodawes.pdfIn PDF document text
    • https://cdn.sqhk.co/zusisoko/jfid2hb/free_ringtones_apple_iphone.pdfIn PDF document text
    • https://gituwelogasof.weebly.com/uploads/1/3/2/8/132814340/xosagimoxedakobubif.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/ihjfhlX/fashion_business_management_jobs_nyc.pdfIn PDF document text
    • http://kernig.store/2500_calorie_meal_plan_for_weight_lossficaw.pdfIn PDF document text
    • https://xosinalujejiwa.weebly.com/uploads/1/3/1/4/131405948/benigumoket.pdfIn PDF document text
    • http://procripton.com/zufutototixajowizuboxijamsby9d.pdfIn PDF document text
    • https://fogisitulen.weebly.com/uploads/1/3/0/7/130775537/govakobuboze_xiwutobosoruwu_demowawifiz_beveganumib.pdfIn PDF document text
    • https://nolujamikudaze.weebly.com/uploads/1/3/4/8/134868466/9853726.pdfIn PDF document text
    • https://cdn.sqhk.co/rizitewav/WibHBx9/34382706715.pdfIn PDF document text
    • https://lebugaboforov.weebly.com/uploads/1/3/5/9/135976333/disepobika.pdfIn PDF document text
    • http://vash-komfort5.ru/surprised_by_hope_nt_wright_review35x1f.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://uploads.strikinglycdn.com/files/5ee45a4a-91d9-4547-9568-4ce0245e1bbd/how_to_cook_beginner_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c0aac89-78ec-4bd4-a3b0-31824040ecf7/50789932002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4939920-fdab-4eec-8bd0-929deb22dcbc/2017_forester_premium_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d3b703b-6f48-42be-98a1-539d06c1d4a5/81854755115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ac252b1-b8a6-40eb-b6a3-268bed72d514/73130308939.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001afee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFEE 4984 bytes
SHA-256: bbb5f0fafaecf41d28dedae0fcdb77e28fb9d0a83487d0e279d359c528b1bda9
font_01_sfnt_off0001c104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C104 16184 bytes
SHA-256: 64e7f54942e5dbb06188e6bd018f3411d442b41c795baa252ff59297a25e565a
font_02_sfnt_off0001f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3EA 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c