Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc87e3cb81d402cf…

MALICIOUS

PDF

77.3 KB Created: 2021-02-21 15:46:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0f955e119f0084e20feee3d294263376 SHA-1: d4525ac9d134425fdbc9c514a85dcaca73b271aa SHA-256: dc87e3cb81d402cf72c3d312977c570527d3170d0a907040ad7c390a3670f03c
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm, indicating a phishing or malicious redirection attempt. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further support its malicious nature. The document body, though heavily corrupted, contains text related to 'Red cross first aid cpr training certification' which is likely a lure to entice users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://baarspo.ru/strik?utm_term=red+cross+first+aid+cpr+training+certification PDF link annotation
    • http://wersita.fun/piano_lessons_near_me_freexm2o7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469640/normal_60173a9b82458.pdfIn PDF document text
    • http://bazis-rostov.com/kesonanawobunscg78.pdfIn PDF document text
    • https://jupufafel.weebly.com/uploads/1/3/2/7/132740723/mesakotujivulegu.pdfIn PDF document text
    • http://reflectionss.space/xasadinumopibevlin8.pdfIn PDF document text
    • http://soldonlittleton.com/mobile_base_station_antennav7z0a.pdfIn PDF document text
    • http://believes.space/puch_maxi_moped_army8vm58.pdfIn PDF document text
    • https://nurerimufiwovu.weebly.com/uploads/1/3/4/3/134394752/moxoginav-watet-joxibaxemalow.pdfIn PDF document text
    • http://parhelifrl.space/zedomunakujemo9ukis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471455/normal_602528bf96f99.pdfIn PDF document text
    • http://nadahul.ru/killing_floor_2_demolitionist_guide_20199a68r.pdfIn PDF document text
    • https://mepokebifonamos.weebly.com/uploads/1/3/4/0/134096039/vivoposonawiwi-xivizodopu-tilujun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498992/normal_5fc7c931c2014.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://s3.amazonaws.com/tezude/4822106235.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/wewowazu.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/hawaii_volcanoes_national_park_guided_hikes.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/39006215366.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/58440391020.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/bollywood_instrumental_song_zip_file.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/nudixufebadafitax.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_off0000e3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EC 5088 bytes
SHA-256: c1689fc299bfd730ddf669c1a19b8845c488a65b65f2e1ffaf23e629c925c2b8
font_01_sfnt_off0000f546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF546 10744 bytes
SHA-256: 4090769253a5800db518e7232227e156d86fa7ac8bdedefac400aaf8ad065e2e
font_02_sfnt_off000119a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A6 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e