Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c495da33f5e1805…

MALICIOUS

PDF

129.2 KB Created: 2021-03-20 00:38:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a2f2aee645b1c58ba6d5d4b35ccb396b SHA-1: c7f359bf65e0e32953806aa48248080799215eeb SHA-256: 6c495da33f5e180563f2ef0a0a2af5153f2c5c5ae661534ccc18a2b5f8aa75c5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and one directly to a URL associated with a 'fake code generator' lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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://nipisod.ru/wix?keyword=fake+code+generator+psn PDF link annotation
    • http://xemokajoled.medianewsonline.com/boy_scout_popcorn_order_form_2020.pdfIn PDF document text
    • https://devumevone.weebly.com/uploads/1/3/4/5/134589636/kalige.pdfIn PDF document text
    • https://somizinizerolu.weebly.com/uploads/1/3/0/8/130873918/venajonotamusatudexu.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/vejobikufaxafazadufar.pdfIn PDF document text
    • http://fexabudobix.getenjoyment.net/5_day_keto_egg_fast_meal_plan.pdfIn PDF document text
    • https://dazifefizax.weebly.com/uploads/1/3/4/8/134854215/xiseke.pdfIn PDF document text
    • https://potamowirojix.weebly.com/uploads/1/3/4/6/134688714/6905004.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/bcafab2c-aeb3-4e99-8c60-981d92981f1d/fopisabafapusogikujajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63196d74-bf53-4ea6-a815-c251b4eec94c/ipad_mini_2nd_generation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d15ca9f7-ca37-4e18-a068-af6231a69103/what_foods_to_eat_when_cleansing.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/24517393422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe0289be-19ba-40bd-8007-b43fae92cb5e/who_is_the_best_marketer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3df6f267-1145-4d16-960b-77740ee50390/shakespeare_julius_caesar_brutus_speech.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b926c689-0f96-4456-ae7b-20f860911c31/maytag_front_load_stackable_washer_and_dryer_set_mhw6630hc-med6630hc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b53bf137-b4ef-4d3f-bbe4-097ed0d68a15/best_baby_and_dog_gates.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/carol_of_the_bells_satb.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/muvorixowadavaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e29cc91-1474-44e2-8b40-33665a45d63e/craftsman_garage_door_opener_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9249b5ab-72fd-481a-a292-9bf1ad4b985e/futegarasudarun.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001997d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1997D 4968 bytes
SHA-256: 891aa7a1755d7d80e7a3eaff84afd0df7a8a06c7b707f9a50ed49637f59df0a9
font_01_sfnt_off0001aa67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA67 12352 bytes
SHA-256: 173f28b7bfd2d6fb9faa6d3bd8056c16a3e1839d21229ad3fd079b0753124091
font_02_sfnt_off0001d478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D478 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90
font_03_sfnt_off0001e90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E90F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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